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end_n draw_v line_n perpendicular_a 3,095 5 14.0786 5 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A93913 Horometria: or the compleat diallist: wherein the whole mystery of the art of dialling is plainly taught three several wayes; two of which are performed geometrically by rule and compasse onely: and the third instrumentally, by a quadrant fitted for that purpose. With the working of such propositions of the sphere, as are most usefull in astronomie and navigation, both geometrically and instrumentally. / By Thomas Stirrup, philomath. Whereunto is added an appendix, shewing now the parallels of declination; the Jewish, Babylonish, and Italian houres; the azimuths, almicanters, &c. may be easily inscribed on any diall whatsoever, by rule and compasse onely. Also how to draw a diall on the seeling of a room, by W.L. Stirrup, Thomas.; W. L. 1652 (1652) Wing S5688; Thomason E667_1; ESTC R203655 83,318 192

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surface_n of_o the_o diameter_n as_o the_o semicircle_n c_o b_o d_o which_o be_v half_a of_o the_o circle_n c_o b_o d_o e_o and_o be_v contain_v above_o the_o diameter_n c_o a_o d._n definition_n 11._o a_o quadrant_n be_v the_o four_o part_n of_o a_o circle_n and_o be_v contain_v betwixt_o the_o semidiameter_n of_o the_o circle_n &_o a_o line_n draw_v perpendicular_a unto_o the_o diameter_n of_o the_o same_o circle_n from_o the_o centre_n thereof_o divide_v the_o semicircle_n into_o two_o equal_a part_n of_o the_o which_o part_n the_o one_o be_v the_o quadrant_n or_o four_o part_n of_o the_o same_o circle_n as_o for_o example_n the_o diameter_n of_o the_o circle_n b_o d_o e_o c_o be_v the_o line_n c_o a_o d_o divide_v the_o circle_n into_o two_o equal_a part_n then_o from_o the_o centre_n a_o raise_v the_o perpendicular_a a_o b_o divide_v the_o semicircle_n likewise_o into_o two_o equal_a part_n so_o be_v a_o b_o d_o or_o a_o b_o c_o the_o quadrant_n of_o the_o circle_n c_o b_o d_o 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come_v unto_o the_o zenith_n these_o be_v circle_n that_o do_v measure_v the_o elevation_n of_o the_o pole_n or_o height_n of_o the_o sun_n moon_n or_o star_n above_o the_o horizon_n which_o be_v call_v the_o almicanter_n of_o the_o sun_n moon_n or_o star_n the_o arch_n of_o the_o sun_n or_o star_n almicanter_n be_v a_o portion_n of_o a_o azimuth_n contain_v betwixt_o that_o almicanter_n which_o pass_v through_o the_o centre_n of_o the_o star_n and_o the_o horizon_n thus_o have_v set_v forth_o unto_o the_o view_n of_o the_o unlearned_a for_o who_o sake_n this_o treatise_n be_v intend_v the_o meaning_n of_o some_o of_o the_o useful_a term_n of_o geometry_n which_o be_v most_o attendant_a unto_o this_o art_n of_o dial_v and_o also_o a_o description_n of_o some_o peculiar_a thing_n concern_v the_o point_n line_n and_o circle_n imagine_v in_o the_o sphere_n be_v very_o fit_a to_o be_v understand_v of_o all_o such_o as_o intend_v to_o practice_v either_o in_o the_o art_n of_o navigation_n 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chord_n of_o a_o circle_n or_o a_o chord_n of_o 90_o and_o be_v divide_v into_o 90_o unequal_a division_n represent_v the_o 90_o degree_n of_o the_o quadrant_n and_o be_v number_v with_o 10_o 20_o 30_o 40_o etc._n etc._n unto_o 90._o this_o chord_n be_v in_o use_n to_o measure_v any_o part_n or_o arch_n of_o a_o circle_n not_o surmount_v 90_o degree_n the_o number_n of_o these_o degree_n from_o 1_o unto_o 60_o be_v call_v the_o radius_fw-la of_o the_o scale_n upon_o which_o distance_n all_o circle_n be_v to_o be_v draw_v whereupon_o 60_o of_o these_o degree_n be_v the_o semidiameter_n of_o any_o circle_n that_o be_v draw_v upon_o that_o radius_fw-la the_o manner_n how_o to_o divide_v the_o line_n of_o chord_n although_o the_o make_n or_o divide_v of_o this_o line_n of_o chord_n be_v well_o know_v unto_o all_o those_o that_o do_v make_v mathematical_a instrument_n yet_o i_o will_v not_o have_v they_o that_o shall_v make_v use_n of_o this_o book_n be_v ignorant_a of_o the_o divide_n of_o this_o line_n therefore_o first_o draw_v the_o diameter_n a_o d_o c_o which_o be_v do_v upon_o the_o centre_n d_o describe_v the_o semicircle_n a_o b_o c_o which_o semicircle_n divide_v into_o two_o equal_a part_n or_o quadrant_n by_o the_o point_n b_o then_o divide_v one_o of_o these_o quadrant_n into_o 90_o equal_a part_n or_o degree_n you_o be_v prepare_v as_o here_o you_o see_v in_o the_o quadrant_n a_o b._n now_o this_o be_v do_v set_v one_o foot_n of_o your_o compass_n in_o the_o point_n a_o and_o let_v the_o other_o be_v extend_v unto_o each_o degree_n or_o the_o quadrant_n a_o b_o and_o these_o extent_n transfer_v into_o the_o line_n a_o d_o c_o as_o here_o you_o see_v be_v do_v this_o line_n so_o divide_v into_o 90_o unequal_a division_n from_o the_o point_n a_o and_o number_v by_o 10_o 20_o 30_o 40_o etc._n etc._n unto_o 90_o be_v call_v a_o line_n of_o chord_n and_o may_v be_v set_v on_o your_o rule_n as_o here_o you_o see_v be_v do_v and_o this_o may_v be_v as_o well_o perform_v within_o the_o quadrant_n d_o a_o b_o by_o transfer_v the_o degree_n of_o the_o quadrant_n a_o b_o into_o the_o line_n a_o e_o b_o or_o into_o any_o other_o line_n and_o here_o you_o may_v see_v that_o when_o you_o open_v your_o compass_n unto_o 60_o degree_n in_o the_o quadrant_n and_o transfer_v it_o into_o the_o line_n a_o d_o that_o it_o will_v light_v upon_o the_o centre_n d_o whereby_o it_o do_v plain_o appear_v that_o 60_o of_o those_o degree_n be_v equal_a to_o the_o semidiameter_n of_o the_o same_o circle_n and_o therefore_o be_v the_o radius_fw-la upon_o which_o all_o circle_n be_v draw_v as_o be_v show_v before_o in_o this_o chapter_n chap._n ii_o how_o speedy_o with_o rule_n and_o compass_n to_o make_v a_o angle_n contain_v any_o degree_n assign_v or_o to_o get_v the_o degree_n of_o any_o angle_n make_v first_o therefore_o to_o make_v a_o angle_n of_o any_o quantity_n open_v your_o compass_n to_o the_o radius_fw-la of_o our_o scale_n and_o set_v one_o foot_n thereof_o in_o the_o point_n a_o with_o the_o other_o foot_n describe_v the_o arch_n b_o c_o then_o draw_v the_o line_n a_o b_o then_z opening_z your_o compass_n to_o so_o many_o degree_n upon_o your_o line_n of_o chord_n as_o you_o will_v lay_v down_o which_o here_o we_o will_v suppose_v to_o be_v 40_o degree_n and_o set_v one_o foot_n in_o b_o with_o the_o other_o make_v a_o mark_n in_o the_o arch_n b_o c_o as_o at_z c_z from_o which_o point_n c_z draw_v the_o line_n c_o a_o which_o shall_v make_v the_o angle_n b_o a_o c_o contain_v 40_o degree_n as_o be_v require_v and_o if_o you_o desire_v to_o find_v the_o quantity_n of_o a_o angle_n open_v the_o compass_n to_o the_o radius_fw-la of_o your_o scale_n &_o set_v one_o foot_n thereof_o in_o the_o point_n a_o and_o with_o the_o other_o describe_v the_o arch_n b_o c_o then_z taking_z the_o distance_n betwixt_o b_o and_o c_o that_o be_v where_o the_o two_o leg_n and_o the_o arch_a line_n cross_v and_o apply_v it_o unto_o the_o line_n of_o chord_n and_o there_o it_o will_v show_v you_o the_o number_n of_o degree_n contain_v in_o that_o angle_n which_o here_o will_v be_v find_v to_o be_v 40_o degree_n chap._n iii_o to_o find_v the_o altitude_n of_o the_o sun_n by_o the_o shadow_n of_o a_o gnomen_fw-la set_v perpendicular_a to_o the_o horizon_n ffirst_o draw_v the_o line_n a_o b_o then_z opening_z your_o compass_n to_o the_o radius_fw-la of_o your_o scale_n set_v one_o foot_n in_o the_o end_n a_o and_o with_o the_o other_o describe_v the_o arch_n b_o c_o d_o then_z opening_z your_o compass_n unto_o the_o whole_a 90_o degree_n with_o one_o foot_n in_o b_o with_o the_o other_o mark_v the_o arch_n b_o c_o d_o in_o the_o point_n d_o from_o which_o point_n d_o draw_v the_o line_n d_o a_o which_o shall_v be_v perpendicular_a unto_o the_o line_n a_o b_o and_o make_v the_o quadrant_n a_o b_o c_o d_o then_o suppose_v the_o height_n of_o your_o gnomon_n or_o substance_n yield_v shadow_n to_o be_v the_o line_n a_o e_o which_o here_o we_o will_v suppose_v to_o be_v 12_o foot_n therefore_o take_v 12_o of_o your_o equal_a division_n from_o your_o scale_n as_o here_o i_o have_v take_v 12_o quarter_n for_o this_o our_o purpose_n and_o set_v they_o down_o from_o a_o to_o e_o and_o draw_v the_o line_n e_o f_o parallel_n to_o a_o b_o then_o suppose_v the_o length_n of_o the_o shadow_n to_o be_v 9_o foot_n for_o this_o 9_o foot_n must_v i_o take_v 9_o of_o the_o same_o division_n as_o i_o do_v before_o and_o place_v they_o from_o e_z to_z g_z by_o which_o point_n g_z draw_v the_o line_n a_o g_o c_o from_o the_o centre_n a_o through_o the_o point_n g_o until_o it_o cut_v the_o arch_n b_o f_o c_o d_o in_o the_o point_n c_o so_fw-mi shall_v the_o arch_n b_o c_o be_v the_o height_n of_o the_o sun_n desire_v which_o in_o this_o example_n will_v be_v find_v to_o be_v 53_o degree_n 8_o minute_n the_o thing_n desire_v chap._n four_o to_o find_v the_o altitude_n of_o the_o sun_n by_o the_o shadow_n of_o a_o gnomon_n stand_v at_o right_a angle_n with_o any_o perpendicular_a wall_n in_o such_o manner_n that_o it_o may_v lie_v parallel_n unto_o the_o horizon_n first_o draw_v your_o quadrant_n a_o b_o c_o d_o as_o be_v teach_v in_o the_o last_o chapter_n &_o place_v the_o length_n of_o your_o gnomon_n from_o a_o to_o e_o which_o here_o we_o will_v suppose_v to_o be_v 12_o foot_n as_o before_o in_o the_o last_o chapter_n then_o draw_v the_o line_n e_o f_o parallel_n to_o a_o b_o then_o suppose_v the_o length_n of_o the_o shadow_n to_o be_v 9_o foot_n as_o before_o this_o i_o place_n from_o e_z to_z g_z
by_o which_o point_n g_z draw_v the_o line_n a_o g_o c_o as_o be_v former_o do_v in_o the_o last_o chapter_n by_o which_o we_o have_v proceed_v thus_o far_o but_o as_o in_o the_o last_o chapter_n the_o arch_n b_o c_o be_v the_o height_n of_o the_o sun_n desire_v so_o by_o this_o chapter_n the_o arch_n c_o d_o shall_v be_v the_o height_n of_o the_o sun_n which_o be_v apply_v unto_o your_o scale_n will_v give_v you_o 36_o deg_fw-la 52_o min._n for_o the_o height_n of_o the_o sun_n desire_v chap._n v._o the_o almicanter_n or_o height_n of_o the_o sun_n be_v give_v to_o find_v the_o length_n of_o the_o right_a shadow_n by_o right_a shadow_n be_v mean_v the_o shadow_n of_o any_o staff_n post_n steeple_n or_o any_o gnomon_n whatsoever_o that_o stand_v at_o right_a angle_n with_o the_o horizon_n the_o one_o end_n thereof_o respect_v the_o zenith_n of_o the_o place_n and_o the_o other_o the_o nadir_n first_o therefore_o according_a unto_o the_o three_o chapter_n describe_v the_o quadrant_n a_o b_o d_o then_o suppose_v the_o height_n of_o your_o gnomon_n or_o substance_n yield_v shadow_n to_o be_v 12_o foot_n as_o in_o the_o former_a chapter_n this_o do_v i_o set_v down_o from_o a_o to_o e_o and_o from_o the_o point_n e_o draw_v the_o line_n e_o f_o parallel_n to_o a_o b_o then_o set_v the_o almicanter_n which_o here_o we_o will_v suppose_v to_o be_v 53_o de_fw-la and_o 8_o min._n as_o it_o be_v find_v by_o the_o three_o chapter_n from_o b_o unto_o c_o from_o which_o point_n c_z draw_v the_o line_n c_o a_o cut_v the_o line_n e_o f_o in_o the_o point_n g_o so_o shall_v e_z g_z be_v the_o length_n of_o the_o right_a shadow_n desire_v which_o be_v take_v betwixt_o your_o compass_n and_o apply_v unto_o your_o scale_n will_v give_v you_o 9_o of_o those_o division_n whereof_o a_o e_z be_v 12_o which_o here_o do_v signify_v 9_o foot_n chap._n vi_o the_o almicanter_n or_o height_n of_o the_o sun_n be_v give_v to_o find_v the_o length_n of_o the_o contrary_a shadow_n by_o the_o contrary_a shadow_n be_v understand_v the_o length_n of_o any_o shadow_n that_o be_v make_v by_o a_o staff_n or_o gnomon_n stand_v at_o right_a angle_n against_o any_o perpendicular_a wall_n in_o such_o a_o manner_n that_o it_o may_v lie_v parallel_n unto_o the_o horizon_n the_o length_n of_o the_o contrary_a shadow_n do_v increase_v as_o the_o sun_n rise_v in_o height_n whereas_o contrariwise_o the_o right_a shadow_n do_v decrease_v in_o length_n as_o the_o sun_n do_v increase_v in_o height_n therefore_o the_o way_n to_o find_v out_o the_o length_n of_o the_o verse_v shadow_n be_v as_o follow_v first_o draw_v your_o quadrant_n as_o be_v teach_v in_o the_o three_o chapter_n now_o suppose_v the_o length_n of_o your_o gnomon_n to_o be_v 12_o foot_n place_v it_o from_o a_o to_o e_o likewise_z from_z e_z draw_v the_o line_n e_o f_o parallel_n to_o a_o b_o as_o before_z now_o suppose_v the_o height_n of_o the_o sun_n to_o be_v 36_o deg_fw-la 52_o min._n take_v it_o from_o your_o scale_n and_o place_n it_o from_o d_o to_z c_z from_o which_o point_n c_z draw_v the_o line_n c_o a_o cut_v the_o line_n e_o f_o in_o the_o point_n g_o so_o shall_v g_z e_z be_v the_o length_n of_o the_o contrary_a shadow_n which_o here_o will_v be_v find_v to_o be_v 9_o foot_n the_o thing_n desire_v chap._n vii_o have_v the_o distance_n of_o the_o sun_n from_o the_o next_o equinoctial_a point_n to_o find_v his_o declination_n first_o draw_v the_o line_n a_o b_o then_o upon_o the_o end_n a_o raise_v the_o perpendicular_a a_o d_o then_o open_v your_o compass_n to_o the_o radius_fw-la of_o the_o scale_n place_n one_o foot_n in_o the_o centre_n a_o and_o with_o the_o other_o draw_v the_o quadrant_n b_o c_o d_o then_o suppose_v the_o sun_n to_o be_v either_o in_o the_o 29_o degree_n of_o taurus_n or_o in_o the_o first_o degree_n of_o leo_n both_o which_o point_n be_v 59_o degree_n distant_a from_o the_o next_o equinoctial_a point_n aries_n or_o if_o the_o sun_n shall_v be_v in_o the_o 29_o 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the_o same_o line_n on_o the_o other_o side_n of_o the_o meridian_n and_o also_o on_o both_o side_n the_o meridian_n in_o the_o upper_a line_n the_o line_n draw_v from_o point_n to_o point_n parallel_n to_o the_o meridian_n c_o e_o shall_v be_v the_o hour_n line_n the_o line_n c_o e_o shall_v be_v the_o meridian_n line_n the_o hour_n of_o 12_o and_o must_v also_o be_v the_o substilar_a line_n whereon_o the_o stile_n must_v stand_v which_o may_v be_v a_o plate_n of_o iron_n or_o some_o other_o metal_n be_v so_o broad_a as_o the_o semidiameter_n of_o the_o circle_n be_v as_o be_v show_v in_o the_o figure_n this_o style_n must_v be_v place_v along_o upon_o the_o line_n of_o 12_o make_v right_a angle_n therewith_o the_o upper_a edge_n whereof_o must_v be_v parallel_n to_o the_o plane_n so_o shall_v it_o cast_v a_o true_a shadow_n upon_o the_o hour_n line_n the_o under_o face_n of_o this_o polar_a plane_n and_o also_o of_o the_o former_a equinoctial_a plane_n be_v make_v altogether_o like_a 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hour_n of_o time_n the_o half_a of_o which_o arch_n be_v 30_o degree_n or_o two_o hour_n from_o the_o meridian_n this_o divide_a in_o the_o half_n will_v be_v 15_o deg_fw-la or_o one_o hour_n from_o the_o meridian_n then_o lay_v your_o rule_n upon_o the_o centre_n i_o of_o the_o equinoctial_a and_o upon_o these_o two_o last_o division_n in_o the_o circle_n thereof_o where_o the_o rule_n shall_v touch_v the_o line_n of_o contingence_n there_o mark_v it_o as_o at_o h_n and_o o_o by_o which_o point_n and_o the_o centre_n c_o you_o may_v draw_v the_o hour-line_n of_o 10_o and_o 11_o the_o like_a may_v you_o do_v on_o the_o other_o side_n of_o the_o meridian_n so_o have_v you_o six_o of_o your_o hour-line_n draw_v and_o now_o because_o the_o contingent_a will_v outrun_v our_o plane_n we_o may_v from_o the_o intersection_n of_o the_o hour_n of_o 9_o and_o 3_o with_o the_o touch_n line_n draw_v the_o line_n f_o d_o and_o g_o e_o parallel_n to_o the_o meridian_n a_o b_o until_o they_o cut_v the_o line_n of_o east_n and_o west_n in_o the_o point_n d_o and_o e_o then_o draw_v the_o line_n a_o d_o and_o a_o e_o this_o be_v do_v set_v one_o foot_n of_o your_o compass_n in_o the_o point_n h_n and_o with_o the_o other_o take_v the_o near_a extent_n unto_o the_o line_n a_o e_o this_o distance_n be_v keep_v fix_v one_o foot_n in_o the_o line_n g_o e_o so_o as_o the_o other_o may_v but_o touch_v the_o line_n a_o e_o so_o shall_v the_o fix_a foot_n rest_n in_o the_o point_n n_n by_o which_o and_o the_o centre_n c_o you_o may_v draw_v the_o 7_o a_o clock_n hour-line_n in_o like_a manner_n may_v you_o place_v one_o foot_n in_o the_o point_n o_o and_o with_o the_o other_o take_v the_o short_a extent_n unto_o the_o line_n a_o e_o with_o this_o distance_n fix_v one_o foot_n in_o the_o line_n g_o e_o so_o as_o the_o other_o may_v but_o only_o touch_v the_o line_n a_o e_o so_o shall_v the_o fix_a foot_n rest_n in_o the_o point_n r_o by_o which_o and_o the_o centre_n c_o you_o may_v draw_v the_o 8_o a_o clock_n hour-line_n the_o like_a may_v be_v do_v on_o the_o other_o side_n of_o the_o meridian_n or_o you_o may_v by_o these_o distance_n thus_o find_v prick_n out_o the_o like_a on_o the_o other_o side_n of_o the_o meridian_n thus_o by_o divide_v but_o half_o a_o quarter_n of_o the_o equinoctial_a circle_n into_o three_o equal_a part_n you_o may_v describe_v your_o whole_a dial_n and_o whereas_o in_o summer_n the_o 4_o and_o 5_o in_o the_o morning_n and_o also_o 7_o and_o 8_o at_o evening_n shall_v be_v necessary_a in_o this_o kind_n of_o dial_n prolong_v or_o draw_v the_o line_n of_o 4_o and_o 5_o at_o evening_n beyond_o the_o centre_n c_o and_o they_o shall_v show_v the_o hour_n of_o 4_o and_o 5_o in_o the_o morning_n and_o likewise_o the_o 7_o and_o 8_o in_o the_o morning_n for_o 7_o and_o 8_o at_o evening_n what_o be_v here_o speak_v concern_v the_o hour_n the_o like_a be_v to_o be_v do_v in_o draw_v the_o half_a hour_n as_o well_o in_o this_o kind_n as_o in_o all_o they_o which_o follow_v the_o style_n must_v be_v fix_v in_o the_o centre_n c_o hang_v direct_o over_o the_o meridian_n line_n a_o c_o with_o so_o great_a a_o angle_n as_o the_o line_n s_o c_o at_fw-fr make_v which_o be_v the_o true_a pattern_n of_o the_o cock_n this_o and_o all_o other_o kind_n of_o dial_n may_v be_v draw_v upon_o a_o clean_a paper_n and_o then_o with_o the_o help_n of_o your_o compass_n place_v on_o your_o plane_n caap._n ix_o to_o draw_v a_o dial_n upon_o a_o erect_v direct_a vertical_a plane_n common_o call_v a_o south_n or_o
shall_v the_o arch_n c_o i_o be_v the_o inclination_n of_o both_o meridian_n and_o be_v find_v by_o this_o example_n to_o be_v 38_o deg_fw-la 13_o min._n so_o that_o by_o this_o example_n the_o meridian_n of_o the_o plane_n will_v fall_v betwixt_o the_o hour_n of_o 2_o and_o 3_o if_o the_o plane_n shall_v decline_v westward_o but_o if_o it_o shall_v decline_v eastward_o then_o shall_v it_o fall_v betwixt_o the_o hour_n of_o 9_o and_o 10_o before_o noon_n chap._n xv._o to_o draw_v a_o dial_n upon_o a_o erect_a or_o vertical_a plane_n decline_v otherwise_o then_o in_o the_o 11_o chapter_n be_v show_v have_v by_o the_o three_o chapter_n find_v the_o declination_n of_o this_o plane_n to_o be_v 32_o degree_n and_o so_o by_o the_o last_o chapter_n find_v the_o elevation_n of_o the_o pole_n above_o the_o plane_n to_o be_v 31_o deg_fw-la 5_o min._n and_o the_o distance_n of_o the_o substile_a from_o the_o meridian_n to_o be_v 22_o deg_fw-la 8_o min._n and_o likewise_o the_o angle_n of_o inclination_n between_o both_o meridian_n to_o be_v 38_o deg_fw-la 13_o min._n we_o may_v proceed_v to_o make_v the_o dial_n after_o this_o manner_n first_o draw_v the_o horizontall_a w_n e_o and_o the_o perpendicular_a line_n z_o n_n cross_v the_o horizontall_a line_n at_o right_a angle_n which_o be_v the_o meridian_n of_o the_o place_n and_o the_o line_n of_o 12._o then_o in_o the_o meridian_n make_v choice_n of_o some_o point_n with_o most_o convenience_n as_o the_o centre_n c_o whereupon_o describe_v your_o dial_n circle_n e_o n_o w._n then_o take_v a_o chord_n of_o 22_o deg_fw-la 8_o min._n from_o your_o scale_n for_o the_o distance_n of_o the_o substile_a from_o the_o meridian_n and_o inscribe_v it_o into_o this_o circle_n from_o the_o meridian_n upon_o these_o condition_n that_o if_o the_o plane_n decline_v west_n then_o must_v the_o substile_a be_v place_v east_n of_o the_o plumb_n line_n but_o if_o the_o declination_n shall_v be_v east_n then_o must_v the_o substile_a be_v place_v west_n from_o the_o meridian_n as_o here_o it_o be_v this_o 22_o deg_fw-la 8_o min._n be_v set_v in_o the_o dial_n circle_n from_o the_o meridian_n at_o n_n unto_o m_n i_o draw_v the_o line_n c_o m_o for_o the_o substile_a then_o through_o the_o centre_n c_o draw_v the_o diameter_n a_o b_o make_v right_a angle_n with_o the_o substile_a c_o m_o above_o this_o diameter_n there_o need_v no_o houre-line_n to_o be_v draw_v if_o the_o plane_n be_v erect_v then_o take_v 31_o deg_fw-la 5_o min._n and_o set_v they_o from_o m_n to_o d_o and_o draw_v the_o line_n c_o d_o s_o for_o the_o style_n then_o from_o m_n the_o end_n of_o the_o style_n draw_v the_o crooked_a line_n m_o s_o cut_v the_o line_n of_o the_o style_n in_o the_o point_n s_o so_o shall_v the_o triangle_n s_o c_o m_o be_v the_o true_a pattern_n for_o the_o cock_n of_o the_o dial_n this_o be_v do_v take_v 38_o deg_fw-la 13_o min._n and_o set_v they_o always_o on_o that_o side_n the_o substile_a whereon_o the_o line_n of_o 12_o lie_v as_o here_o from_o m_n to_o h_n so_o shall_v the_o point_n h_n be_v the_o point_n where_o you_o shall_v begin_v to_o divide_v your_o dial_n circle_n into_o 24_o equal_a part_n but_o those_o point_n shall_v be_v only_o in_o use_n which_o do_v fall_v below_o the_o diameter_n a_o c_o b._n and_o if_o the_o line_n of_o the_o substile_a fall_v not_o direct_o upon_o one_o of_o the_o hour_n line_n then_o shall_v you_o have_v six_o point_n on_o each_o side_n thereof_o from_o which_o you_o may_v let_v perpendicular_o fall_v unto_o the_o line_n of_o the_o substile_a as_o here_o you_o see_v do_v when_o you_o have_v draw_v and_o describe_v your_o dial_n upon_o paper_n for_o any_o plane_n whatsoever_o you_o may_v cut_v off_o the_o hour-line_n cock_n and_o all_o with_o a_o lesser_a circle_n than_o the_o dial_n circle_n either_o with_o a_o concentrique_fw-la or_o a_o excentrique_fw-la circle_n and_o so_o make_v a_o dial_n less_o than_o the_o circle_n by_o which_o you_o frame_v it_o or_o if_o you_o extend_v the_o hour-line_n beyond_o the_o dial_n circle_n you_o may_v cut_v they_o off_o either_o with_o a_o great_a concentrique_fw-la circle_n and_o so_o make_v a_o big_a dial_n or_o else_o you_o may_v cut_v they_o off_o with_o a_o square_n as_o here_o you_o see_v in_o the_o follow_a figure_n or_o any_o other_o form_n what_o you_o shall_v think_v most_o convenient_a of_o a_o plane_n fall_v near_o the_o meridian_n when_o as_o the_o declination_n of_o a_o plane_n shall_v cause_v it_o to_o lie_v near_o the_o meridian_n as_o that_o the_o declination_n and_o inclination_n shall_v cause_v it_o to_o lie_v near_o the_o pole_n then_o do_v the_o elevation_n of_o the_o pole_n above_o the_o plane_n grow_v so_o small_a &_o the_o hour-line_n so_o exceed_v near_o together_o that_o except_o the_o plane_n be_v very_o large_a they_o will_v hardly_o serve_v to_o good_a purpose_n as_o here_o in_o this_o figure_n be_v a_o plane_n which_o be_v erect_v and_o decline_v from_o the_o south_n 80_o deg_fw-la towards_o the_o east_n therefore_o first_o draw_v your_o dial_n very_o true_a as_o before_o have_v be_v teach_v upon_o a_o large_a paper_n make_v your_o circle_n as_o big_a as_o you_o can_v then_o extend_v the_o houre-line_n with_o the_o substile_a and_o the_o line_n of_o the_o stile_n a_o great_a way_n beyond_o the_o dial_n circle_n until_o they_o do_v spread_v so_o that_o they_o will_v fill_v the_o plane_n indifferent_a well_o and_o then_o cut_v they_o off_o with_o a_o long_a square_a as_o o_o n_n in_o the_o follow_a figure_n so_o will_v it_o show_v almost_o a_o erect_a dial_n decline_v from_o the_o south_n 80_o deg_fw-la towards_o the_o east_n the_o distance_n of_o the_o substile_a from_o the_o meridian_n 37_o deg_fw-la 4_o min._n the_o elevation_n of_o the_o pole_n above_o the_o plane_n 6_o deg_fw-la 4_o min._n and_o the_o inclination_n of_o both_o meridian_n 82_o deg_fw-la 5_o min._n like_o the_o meridian_n dial_n of_o the_o 7_o chapter_n for_o the_o hour_n will_v be_v almost_o parallel_v the_o one_o to_o the_o other_o and_o the_o stile_n almost_o parallel_n to_o the_o substile_a as_o you_o may_v see_v by_o the_o figure_n chap._n xvi_o the_o inclination_n of_o a_o meridian_n plane_n be_v give_v how_o thereby_o to_o find_v the_o elevation_n of_o the_o pole_n above_o the_o plane_n the_o distance_n of_o the_o substile_a from_o the_o meridian_n and_o the_o angle_n of_o the_o inclination_n of_o the_o meridian_n of_o the_o plane_n to_o the_o meridian_n of_o the_o place_n all_o those_o plane_n wherein_o the_o horizontall_a line_n be_v the_o same_o with_o the_o meridian_n line_n be_v therefore_o call_v meridian_n plane_n if_o they_o make_v right_a angle_n with_o the_o horizon_n they_o be_v call_v erect_v meridian_n plane_n and_o be_v describe_v before_o but_o if_o they_o lean_a to_o the_o horizon_n they_o be_v then_o call_v incliner_n these_o may_v incline_v either_o to_o the_o east_n part_n of_o the_o horizon_n or_o to_o the_o west_n and_o each_o of_o they_o have_v two_o face_n the_o upper_a towards_o the_o zenith_n the_o low_a towards_o the_o nadir_n wherein_o know_v the_o latitude_n of_o the_o place_n and_o the_o inclination_n of_o the_o plane_n to_o the_o horizon_n we_o be_v to_o consider_v three_o thing_n more_o before_o we_o can_v come_v to_o the_o draw_v of_o the_o dial_n i._o the_o elevation_n of_o the_o pole_n above_o the_o plane_n ii_o the_o distance_n of_o the_o substile_a from_o the_o meridian_n iii_o the_o angle_n of_o inclination_n betwixt_o both_o meridian_n these_o three_o may_v be_v find_v after_o this_o manner_n little_o differ_v from_o the_o 14_o chap._n first_o describe_v a_o quadrant_n as_o a_o b_o c_o then_o set_v 52_o deg_fw-la 30_o min._n your_o latitude_n from_o c_o to_o e_z in_o the_o arch_n of_o your_o quadrant_n c_o b_o and_o draw_v the_o line_n e_o r_o parallel_n to_o a_o b_o cut_v the_o line_n a_o c_o in_o the_o point_n r_o and_o with_o the_o distance_n e_o r_o with_o one_o foot_n in_o the_o centre_n a_o with_o the_o other_o draw_v the_o arch_n g_o h_o o_o d_o then_o let_v your_o inclination_n be_v 30_o deg_fw-la which_o set_v in_o the_o arch_n of_o the_o quadrant_n from_o b_o to_o f_o and_o draw_v the_o line_n a_o f_o cut_v the_o arch_n g_o o_fw-fr d_o in_o the_o point_n h_n through_o which_o point_n h_n draw_v the_o line_n s_o h_n n_n cut_v the_o arch_n of_o the_o quadrant_n in_o the_o point_n n_n so_o shall_v the_o arch_n c_o n_n be_v the_o elevation_n of_o the_o pole_n above_o the_o plane_n which_o in_o this_o example_n be_v 43_o deg_fw-la 23_o min._n this_o be_v do_v from_o the_o point_n l_o draw_v the_o line_n l_o t_o parallel_n to_o the_o line_n a_o c_o cut_v the_o arch_n
g_o d_o in_o the_o point_n o_o through_o which_o point_n o_o draw_v the_o line_n a_o o_o i_o cut_v the_o arch_n of_o the_o quadrant_n b_o c_o in_o the_o point_n i_o so_o shall_v the_o arch_n c_o i_o be_v the_o inclination_n of_o the_o meridian_n of_o the_o plane_n to_o the_o meridian_n of_o the_o place_n and_o in_o this_o example_n be_v find_v to_o be_v 43_o deg_fw-la 28_o min._n which_o be_v resolve_v into_o time_n do_v give_v about_o two_o hour_n and_o 54_o min._n from_o the_o meridian_n for_o the_o place_n of_o the_o substile_a among_o the_o houre-line_n chap._n xvii_o to_o draw_v a_o dial_n upon_o the_o meridian_n incline_v plane_n have_v by_o the_o second_o chapter_n find_v the_o inclination_n of_o this_o plane_n to_o be_v 30_o deg_fw-la and_o so_o by_o the_o last_o chapter_n find_v the_o elevation_n of_o the_o pole_n above_o the_o plane_n to_o be_v 43_o deg_fw-la 23_o min._n and_o the_o distance_n of_o the_o substile_a from_o the_o meridian_n to_o be_v 33_o deg_fw-la 5_o min._n and_o likewise_o the_o angle_n of_o inclination_n to_o be_v 43_o deg_fw-la 38_o min._n we_o may_v proceed_v to_o make_v the_o dial_n after_o this_o manner_n first_o draw_v the_o horizontall_a line_n a_o b_o serve_v for_o the_o meridian_n and_o the_o hour_n of_o 12_o about_o the_o middle_n of_o this_o line_n make_v choice_n of_o a_o centre_n at_o c_o upon_o which_o describe_v a_o circle_n for_o your_o dial_n as_o a_o d_o b_o e._n then_o see_v this_o be_v the_o upper_a face_n of_o the_o plane_n set_v 33_o deg_fw-la 5_o min._n the_o distance_n of_o the_o substile_a from_o the_o meridian_n in_o the_o dial_n circle_n from_o the_o north_n end_n of_o the_o horizontall_a line_n upward_o as_o from_o b_o to_o h_n and_o draw_v the_o line_n c_o h_n for_o the_o substile_a but_o if_o this_o have_v be_v the_o under_o face_n the_o substile_a must_v have_v fall_v below_o the_o horizontall_a line_n now_o through_o the_o centre_n c_o draw_v the_o diameter_n e_o f_o make_v right_a angle_n with_o the_o substile_a c_o h._n then_o set_v 43_o deg_fw-la 23_o min._n from_o h_n unto_o d_o for_o the_o stile_n and_o draw_v the_o line_n c_o d_o unto_o s_n and_o from_o the_o end_n of_o the_o substile_a draw_v the_o crooked_a line_n h_o s_o cut_v the_o line_n of_o the_o stile_n in_o the_o point_n s_o so_o shall_v the_o triangle_n s_o c_o h_n be_v the_o true_a pattern_n of_o your_o cock_n for_o this_o dial_n then_o set_v 43_o deg_fw-la 28_o min._n from_o h_n unto_o m_n for_o the_o difference_n betwixt_o the_o meridian_n of_o the_o plane_n and_o the_o meridian_n of_o the_o place_n now_o here_o at_o m_o must_v you_o begin_v to_o divide_v your_o circle_n into_o 24_o equal_a part_n from_o which_o point_n let_v down_o so_o many_o perpendicular_o to_o the_o substile_a as_o there_o shall_v be_v point_n on_o that_o side_n the_o diameter_n e_o f_o next_o the_o substile_a now_o take_v each_o perpendicular_a betwixt_o your_o compass_n and_o with_o one_o foot_n in_o the_o centre_n c_o with_o the_o other_o 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plane_n we_o have_v seven_o thing_n more_o to_o consider_v before_o we_o can_v come_v to_o the_o draw_v of_o the_o dial_n i._o the_o angle_n of_o intersection_n betwixt_o the_o plane_n and_o the_o meridian_n ii_o the_o arch_n of_o the_o plane_n betwixt_o the_o horizon_n and_o the_o meridian_n iii_o the_o arch_n of_o the_o meridian_n betwixt_o the_o horizon_n and_o the_o plane_n iv_o the_o arch_n of_o the_o meridian_n between_o the_o pole_n and_o the_o plane_n v._o the_o elevation_n of_o the_o pole_n above_o the_o plane_n vi_o the_o distance_n of_o the_o substile_a from_o the_o meridian_n vii_o the_o angle_n of_o inclination_n betwixt_o the_o meridian_n of_o the_o plane_n and_o the_o meridian_n of_o the_o place_n all_o these_o seven_o may_v be_v find_v out_o after_o this_o manner_n first_o describe_v the_o quadrant_n a_o b_o c_o then_o suppose_v the_o plane_n to_o decline_v from_o the_o south_n towards_o the_o east_n 35_o deg_fw-la and_o to_o incline_v towards_o the_o horizon_n 25_o deg_fw-la set_v 35_o deg_fw-la the_o declination_n of_o the_o plane_n from_o c_o to_o e_z in_o the_o quadrant_n arch_n c_o b_o and_o draw_v the_o line_n a_o e_o then_o set_v 25_o deg_fw-la the_o inclination_n of_o the_o plane_n in_o the_o same_o arch_n from_o b_o to_o f_o and_o draw_v the_o line_n f_o z_o parallel_n to_o a_o c_o cut_v the_o line_n a_o b_o in_o the_o point_n z_o and_o with_o the_o distance_n f_o z_o and_o one_o foot_n place_v in_o the_o centre_n a_o with_o the_o other_o describe_v the_o arch_n g_o h_n i_o cut_v the_o line_n a_o e_o in_o the_o point_n h_n through_o which_o point_n h_n draw_v the_o line_n k_o l_o parallel_n to_o a_o c_z cut_v the_o arch_n c_o b_o in_o the_o point_n k_o then_o take_v the_o distance_n h_o l_o and_o set_v it_o in_o the_o line_n f_o z_o from_o z_o unto_o o_o through_o which_o point_n o_o draw_v the_o line_n a_o o_fw-fr m_o cut_v the_o arch_n b_o c_o in_o the_o point_n m_o from_o which_o point_n m_n draw_v the_o line_n m_o p_o n_o parallel_n to_o a_o b_o cut_v the_o arch_n g_o i_o in_o the_o point_n p_o through_o which_o point_n p_o draw_v the_o line_n a_o p_o qui_fw-fr cut_v the_o arch_n b_o c_o in_o the_o point_n g_o so_o shall_v the_o arch_n b_o k_n be_v 75_o deg_fw-la 58_o min._n the_o inclination_n of_o the_o plane_n to_o the_o meridian_n and_o the_o arch_n b_o q_o will_v be_v 57_o deg_fw-la 36_o min._n for_o the_o meridian_n ascension_n or_o the_o arch_n of_o the_o plane_n betwixt_o the_o horizon_n and_o the_o meridian_n and_o the_o arch_n b_o m_o shall_v be_v 20_o deg_fw-la 54_o min._n for_o the_o elevation_n of_o the_o meridian_n or_o the_o arch_n of_o the_o meridian_n betwixt_o the_o
horizon_n and_o the_o plane_n now_o if_o the_o plane_n shall_v incline_v towards_o the_o south_n add_v this_o elevation_n of_o the_o meridian_n to_o your_o latitude_n and_o the_o sum_n of_o both_o shall_v be_v the_o position_n latitude_n or_o the_o arch_n of_o the_o meridian_n betwixt_o the_o pole_n and_o the_o plane_n and_o if_o the_o sum_n shall_v exceed_v 90_o deg_fw-la take_v it_o out_o of_o 180_o deg_fw-la and_o that_o which_o remain_v shall_v be_v the_o position_n latitude_n or_o the_o arch_n of_o the_o meridian_n between_o the_o pole_n and_o the_o plane_n this_o be_v do_v set_v 31_o deg_fw-la 36_o min._n the_o position_n latitude_n from_o b_o to_o t_n in_o the_o arch_n b_o c_o and_o draw_v the_o line_n a_o t_o then_o with_o the_o distance_n k_o l_o upon_o the_o centre_n a_o describe_v the_o arch_n y_fw-fr m_o w_n cut_v the_o line_n a_o t_o in_o the_o point_n m_o through_o which_o point_n m_n draw_v the_o line_n r_o s_o parallel_n to_o a_o b_o cut_v the_o arch_n b_o c_o in_o the_o point_n s_o so_o shall_v the_o arch_n b_o s_n be_v 30_o degree_n 33_o minute_n the_o height_n of_o the_o pole_n above_o the_o plane_n then_o lay_v your_o rule_n upon_o the_o point_n s_o and_o the_o centre_n a_o and_o where_o it_o shall_v cut_v the_o line_n k_o l_o the_fw-mi make_v a_o mark_n as_o at_o v._o through_o which_o point_n v_n draw_v the_o line_n d_o v_o n_o w_n parallel_n to_o a_o b_o cut_v the_o arch_n y_o w_n in_o the_o point_n n_n and_o the_o arch_n b_o c_o in_o w_n so_o shall_v the_o arch_n b_o w_n be_v 8_o deg_fw-la 35_o min._n the_o distance_n of_o the_o substile_a from_o the_o meridian_n last_o through_o the_o point_n n_n draw_v the_o line_n y_o x_o parallel_n to_o a_o c_o cut_v the_o arch_n b_o c_o in_o the_o point_n x_o so_o shall_v the_o arch_n b_o x_o be_v 16_o deg_fw-la 20_o min._n the_o inclination_n of_o the_o meridian_n of_o the_o plane_n to_o the_o meridian_n of_o the_o place_n chap._n xix_o to_o draw_v a_o dial_n upon_o a_o decline_a incline_a plane_n 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line_n with_o the_o declination_n of_o the_o plane_n as_o from_o b_o to_o n_n and_o draw_v the_o line_n c_o n_n for_o the_o hour_n of_o 12._o then_o set_v 8_o deg_fw-la 35_o min._n the_o distance_n of_o the_o substile_a from_o the_o meridian_n from_o n_n to_o m_n on_o that_o side_n the_o meridian_n which_o be_v contrary_a to_o the_o declination_n of_o the_o plane_n and_o draw_v the_o line_n c_o m_o for_o the_o substile_a and_o set_v 30_o deg_fw-la 33_o min._n from_o m_n to_o d_o and_o draw_v the_o line_n c_o d_o unto_o s_n and_o from_o the_o end_n of_o the_o substile_a draw_v the_o crooked_a line_n m_o s_o cut_v the_o line_n of_o the_o style_n in_o s_n so_o shall_v the_o triangle_n m_o c_o s_o be_v the_o true_a pattern_n of_o this_o dial_n cock._n then_o set_v 17_o deg_fw-la 30_o min._n the_o inclination_n of_o meridian_n from_z m_o unto_o o_o which_o be_v the_o point_n where_o you_o must_v begin_v to_o divide_v your_o dial_n circle_n into_o 24_o equal_a part_n from_o which_o point_n let_v down_o so_o many_o perpendicular_o to_o the_o substile_a as_o there_o shall_v be_v point_n on_o that_o side_n the_o diameter_n f_o e_o next_z the_o substile_a and_o so_o by_o work_v as_o before_o have_v be_v show_v you_o may_v draw_v the_o houre-line_n and_o set_v up_o the_o stile_n as_o in_o the_o former_a plane_n now_o here_o i_o will_v have_v you_o well_o to_o consider_v what_o have_v be_v here_o speak_v concern_v these_o kind_n of_o dial_n and_o also_o what_o follow_v the_o same_o for_o if_o you_o mark_v the_o diversity_n which_o do_v arise_v by_o reason_n of_o the_o elevation_n of_o the_o meridian_n you_o may_v perceive_v thereby_o three_o sundry_a kind_n of_o dial_n to_o arise_v out_o of_o a_o north_n incline_v plane_n decline_v and_o also_o in_o a_o south_n incline_v decline_a plane_n yet_o in_o effect_n they_o be_v but_o one_o if_o you_o consider_v what_o follow_v here_o concern_v they_o in_o all_o which_o the_o stile_n with_o the_o substile_a and_o such_o like_a material_n be_v find_v out_o according_a to_o the_o last_o chapter_n and_o upon_o the_o under_o face_n of_o all_o north_n incliner_n who_o meridians_fw-la elevation_n be_v less_o than_o the_o latitude_n of_o the_o place_n on_o the_o upper_a face_n of_o all_o north_n incliner_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n of_o the_o place_n and_o on_o the_o under_o face_n of_o all_o south_n incliner_n the_o south_n pole_n be_v elevate_v now_o for_o place_v the_o meridian_n from_o the_o horizontall_a line_n upon_o the_o upper_a face_n of_o all_o south_n incliner_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n compliment_n on_o the_o under_o face_n of_o all_o south_n incliner_n who_o meridians_fw-la elevation_n be_v less_o than_o the_o latitude_n compliment_n on_o the_o under_o face_n of_o all_o north_n incliner_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n of_o the_o place_n and_o on_o the_o upper_a face_n of_o all_o north_n incliner_n who_o meridian_n elevation_n be_v less_o than_o the_o latitude_n of_o the_o place_n the_o meridian_n must_v be_v place_v above_o the_o horizontall_a line_n as_o here_o in_o this_o example_n and_o therefore_o by_o the_o contrary_a upon_o the_o upper_a face_n of_o all_o south_n incliner_n who_o meridians_fw-la elevation_n be_v less_o than_o the_o latitude_n compliment_n on_o the_o under_o face_n of_o all_o south_n incliner_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n compliment_n on_o the_o under_o face_n of_o all_o north_n incliner_n who_o meridians_fw-la elevation_n be_v less_o than_o the_o latitude_n of_o the_o place_n and_o on_o the_o upper_a face_n of_o all_o north_n incliner_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n of_o the_o place_n the_o meridian_n must_v be_v place_v below_o the_o horizontall_a line_n but_o here_o you_o must_v observe_v that_o if_o it_o be_v either_o the_o upper_a or_o under_o face_n of_o a_o south_n incline_v plane_n who_o meridians_fw-la elevation_n be_v great_a than_o the_o latitude_n compliment_n or_o either_o the_o upper_a or_o under_o face_n of_o a_o north_n incline_v plane_n who_o meridians_fw-la elevation_n be_v less_o than_o the_o latitude_n of_o the_o place_n that_o then_o the_o meridian_n must_v be_v place_v from_o that_o end_n of_o the_o horizontall_a line_n with_o the_o declination_n of_o the_o plane_n but_o on_o all_o the_o other_o face_n of_o these_o kind_n of_o plane_n the_o meridian_n must_v be_v place_v from_o that_o end_n of_o the_o horizontall_a line_n which_o be_v contrary_a to_o the_o declination_n of_o the_o plane_n and_o here_o note_v that_o if_o the_o inclination_n shall_v be_v southward_o and_o the_o elevation_n of_o the_o meridirn_n equal_a to_o the_o compliment_n of_o your_o latitude_n then_o shall_v the_o substile_a lie_n square_a to_o the_o meridian_n and_o if_o the_o inclination_n shall_v be_v northward_o and_o the_o elevation_n of_o the_o meridian_n equal_a to_o the_o latitude_n of_o the_o place_n then_o shall_v neither_o pole_n be_v elevate_v above_o this_o plane_n and_o therefore_o shall_v be_v a_o polar_a decline_a plane_n wherein_o the_o meridian_n be_v place_v according_a to_o his_o ascension_n from_o the_o horizontall_a line_n shall_v be_v in_o place_n of_o the_o substile_a unto_o which_o if_o you_o draw_v a_o line_n square_n it_o shall_v serve_v for_o the_o equator_fw-la then_o set_v one_o foot_n of_o your_o compass_n in_o the_o intersection_n of_o the_o substile_a with_o the_o equator_fw-la and_o open_v the_o other_o to_o any_o convenient_a distance_n upon_o the_o substile_a and_o describe_v the_o equinoctial_a circle_n as_o in_o the_o sixth_o chapter_n of_o this_o book_n be_v show_v upon_o
the_o centre_n whereof_o make_v a_o angle_n with_o the_o line_n of_o the_o substile_a equal_a to_o the_o inclination_n of_o both_o meridians_fw-la namely_o the_o meridian_n of_o the_o plane_n and_o the_o meridian_n of_o the_o place_n which_o shall_v show_v you_o where_o to_o begin_v to_o divide_v your_o equinoctial_a circle_n into_o twenty_o four_o equal_a part_n these_o thing_n be_v know_v you_o may_v proceed_v to_o make_v your_o dial_n and_o set_v up_o the_o cock_n according_a to_o the_o six_o chapter_n as_o for_o example_n in_o our_o latitude_n of_o 52_o deg_fw-la 30_o min._n a_o plane_n be_v propose_v to_o decline_v from_o the_o south_n towards_o the_o east_n 35_o deg_fw-la as_o before_o but_o incline_v northward_o 57_o deg_fw-la 50_o min._n the_o meridian_n ascension_n by_o the_o 18_o chapter_n will_v be_v find_v to_o be_v 69_o deg_fw-la 33_o min._n and_o his_o elevation_n 52_o deg_fw-la 30_o min._n equal_a to_o the_o latitude_n of_o the_o place_n and_o therefore_o neither_o 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a_o horizontall_a line_n upon_o the_o upper_a face_n by_o lay_v a_o ruler_n thereupon_o and_o apply_v the_o side_n a_o b_o of_o your_o quadrant_n to_o the_o under_o side_n thereof_o still_o move_v your_o rule_n until_o the_o thread_n and_o plummet_n do_v fall_v direct_o upon_o the_o plumb_n line_n a_o c_o the_o rule_n lie_v thus_o close_o to_o the_o plane_n you_o may_v thereby_o draw_v a_o line_n parallel_n to_o the_o horizon_n have_v draw_v this_o horizontall_a line_n m_o n_n cross_v it_o at_o right_a angle_n with_o the_o perpendicular_a k_o d_o unto_o which_o if_o it_o be_v the_o under_o face_n apply_v the_o side_n a_o b_o of_o your_o quadrant_n so_o shall_v the_o thread_n upon_o the_o limb_n give_v you_o the_o angle_n of_o inclination_n require_v but_o if_o it_o be_v the_o upper_a face_n of_o the_o plane_n then_o lay_v a_o ruler_n to_o the_o perpendicular_a k_o d_o unto_o the_o under_o side_n whereof_o apply_v the_o side_n a_o b_o of_o your_o quadrant_n as_o be_v here_o show_v in_o 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a_o b_o of_o the_o last_o chapter_n place_v it_o from_o c_o southward_n to_o e_z that_o be_v from_o the_o same_o end_n of_o the_o horizontall_a line_n with_o which_o the_o angle_n be_v make_v upon_o the_o plane_n and_o draw_v the_o line_n e_o z_o then_o suppose_v the_o altitude_n of_o the_o sun_n at_o the_o same_o time_n to_o be_v 30_o deg_fw-la 45_o min._n with_o 11_o deg_fw-la 30_o min._n north_n declination_n and_o so_o by_o the_o 21_o chapter_n of_o the_o four_o book_n the_o azimuth_n will_v be_v find_v to_o be_v 23_o deg_fw-la 17_o min._n from_o the_o east_n southward_o be_v the_o observation_n be_v make_v in_o the_o forenoon_n this_o 23_o deg_fw-la 17_o min._n i_o place_v from_o e_z the_o place_z of_o the_o sun_n at_o the_o time_n of_o observation_n unto_o r_n which_o be_v the_o true_a point_n of_o the_o east_n and_o draw_v the_o line_n h_o r_n represent_v the_o vertical_a circle_n so_o shall_v the_o angle_v make_v between_o the_o horizontall_a line_n of_o the_o plane_n and_o 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thereof_o as_o before_o you_o find_v it_o by_o your_o observation_n as_o here_o from_o d_o to_z e_z and_o draw_v the_o line_n e_o z_o for_o the_o line_n of_o the_o shadow_n and_o have_v find_v the_o azimuth_n of_o the_o sun_n 23_o deg_fw-la 17_o min._n from_o the_o east_n southward_o you_o may_v set_v it_o from_o e_z the_o place_z of_o the_o sun_n northward_o to_o r_n and_o draw_v the_o line_n r_o z_o h_n for_o the_o line_n of_o east_n and_o west_n as_o before_o or_o if_o you_o take_v the_o sun_n azimuth_n from_o the_o south_n which_o in_o this_o example_n will_v be_v 66_o deg_fw-la 43_o min._n the_o compliment_n of_o the_o former_a 23_o deg_fw-la 17_o min._n you_o may_v set_v it_o from_o e_z the_o place_z of_o the_o sun_n unto_o s_n southward_o and_o draw_v the_o line_n s_o z_o n_n for_o the_o meridian_n so_o shall_v the_o arch_n s_o d_o or_o r_o c_o be_v 15_o deg_fw-la 13_o min._n for_o the_o declination_n as_o before_o chap._n iv_o to_o draw_v the_o houre-line_n upon_o the_o 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