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earth_n 2_o it_o skill_v not_o in_o the_o former_a of_o what_o material_a substance_n the_o sphere_n consist_v so_o the_o part_n of_o it_o answer_v in_o due_a symmetry_n and_o proportion_n to_o the_o part_n of_o the_o earth_n but_o this_o represent_v the_o whole_a as_o a_o homogeneal_a part_n communicate_v the_o same_o nature_n &_o substance_n with_o the_o whole_a sphere_n of_o the_o earth_n in_o the_o fabric_n of_o this_o instrument_n we_o must_v consider_v 1_o the_o matter_n 2_o the_o form_n the_o matter_n as_o we_o have_v already_o intimate_v be_v a_o magnetical_a substance_n which_o ought_v to_o be_v choose_v out_o of_o a_o most_o eminent_a mine_n have_v all_o his_o part_n pure_a and_o unmix_a as_o possible_a we_o can_v find_v in_o any_o magnet_n for_o though_o all_o lodestone_n have_v the_o same_o inclination_n yet_o in_o many_o the_o vigour_n be_v so_o weak_a or_o at_o least_o so_o hinder_v by_o the_o mixture_n of_o some_o heterogeneal_a matter_n that_o they_o will_v not_o so_o well_o and_o sensible_o perform_v their_o office_n the_o form_n of_o it_o be_v the_o roundness_n &_o politure_n wherein_o art_n shall_v show_v as_o much_o exactness_n as_o she_o can_v such_o a_o sphere_n may_v well_o be_v express_v in_o this_o figure_n whereof_o we_o have_v former_o occasion_n to_o make_v use_n wherein_o the_o footstep_n of_o this_o magnetical_a vigour_n be_v sensible_o express_v no_o otherwise_o then_o in_o the_o great_a body_n of_o the_o earth_n 12_o in_o this_o magnetical_a terrella_n two_o thing_n be_v chief_o to_o be_v note_v 1_o the_o invention_n of_o the_o pole_n 2_o of_o the_o parallel_n &_o meridian_n both_o which_o shall_v be_v teach_v in_o these_o proposition_n 1_o to_o find_v out_o the_o pole_n in_o the_o magnetical_a terrella_n to_o perform_v this_o conclusion_n many_o artificial_a way_n have_v be_v invent_v 1_o by_o the_o inclinatory_a needle_n for_o be_v even_o hang_v in_o such_o sort_n upon_o the_o terrella_n as_o may_v be_v see_v in_o the_o former_a 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the_o south_n many_o other_o way_n may_v be_v invent_v by_o mechanicians_n perhaps_o more_o curious_a to_o who_o industry_n i_o refer_v my_o ingenious_a reader_n 2_o the_o circle_n in_o the_o terrella_n be_v find_v out_o by_o the_o magnetical_a needle_n this_o need_v no_o other_o ocular_a demonstration_n than_o we_o have_v teach_v in_o the_o four_o chapter_n and_o may_v be_v conceive_v in_o the_o former_a diagramme_n first_o we_o see_v the_o magnetical_a needle_n according_a to_o diverse_a point_n diverse_o to_o conform_v itself_o which_o have_v give_v way_n to_o ingenious_a artificer_n to_o find_v out_o the_o parallel_n and_o meridian_n the_o parallel_n be_v find_v out_o by_o observe_v the_o angle_n of_o declination_n of_o the_o needle_n hang_v over_o the_o terrella_n which_o be_v find_v in_o proportion_n to_o answer_v to_o the_o degree_n of_o latitude_n which_o dr_n ridley_n in_o his_o magnetical_a treatise_n have_v
circle_n &_o the_o diameter_n be_v the_o ground_n of_o the_o quadrature_n of_o a_o circle_n be_v a_o matter_n which_o have_v set_v a_o work_n the_o great_a wit_n of_o the_o world_n have_v notwithstanding_o as_o yet_o by_o no_o man_n be_v bring_v to_o discovery_n in_o so_o much_o as_o pitiscus_n and_o other_o good_a mathematician_n may_v well_o doubt_v whether_o ever_o it_o will_v come_v to_o light_v nevertheless_o where_o exactness_n can_v be_v find_v we_o must_v come_v as_o near_o as_o we_o can_v the_o near_a proportion_n in_o number_n which_o any_o can_v yet_o light_v on_o be_v as_o 22_o to_o 7_o which_o in_o so_o great_a and_o massy_a a_o body_n as_o the_o earth_n may_v pass_v without_o any_o sensible_a or_o explicable_a error_n suppose_v then_o out_o of_o our_o precedent_a supposition_n the_o whole_a circuit_n of_o the_o earth_n to_o be_v 21600_o italian-mile_n which_o be_v the_o common_a opinion_n now_o receive_v i_o multiply_v according_a to_o the_o golden_a rule_n 21600_o by_o 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