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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
A64223 The semicircle on a sector in two books. Containing the description of a general and portable instrument; whereby most problems (reducible to instrumental practice) in astronomy, trigonometry, arithmetick, geometry, geography, topography, navigation, dyalling, &c. are speedily and exactly resolved. By J. T. Taylor, John, 1666 or 7-1687. 1667 (1667) Wing T533B; ESTC R221720 52,688 153

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next_o the_o outward_a limb_n of_o the_o movable_a and_o loose_a piece_n both_o yet_o because_o it_o be_v requisite_a to_o have_v pin_n to_o keep_v the_o loose_a piece_n close_o in_o its_o place_n you_o may_v have_v two_o sight_n more_o to_o supply_v their_o place_n which_o sometime_o you_o may_v make_v use_n of_o and_o so_o the_o number_n of_o sight_n may_v be_v five_o viz._n two_o slide_a sight_n one_o turn_v sight_n and_o two_o pin_n sight_n to_o put_v into_o the_o hole_n at_o the_o end_n of_o the_o fix_a and_o movable_a piece_n to_o hold_v the_o tenon_n of_o the_o loose_a piece_n close_o joint_v every_o one_o of_o these_o sight_n have_v a_o fiducial_a or_o perpendicular_a line_n draw_v down_o the_o middle_n of_o they_o from_o the_o top_n to_o the_o bottom_n where_o this_o line_n touch_v the_o graduation_n on_o the_o limb_n be_v the_o point_n of_o observation_n the_o place_n of_o these_o sight_n have_v a_o oval_a proportion_n about_o the_o middle_n of_o they_o only_o leave_v a_o 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