of_o the_o magnet_n we_o may_v hope_v to_o discover_v all_o epicurus_n his_o atom_n des-cartes_n his_o globuli_fw-la aetherii_fw-la and_o all_o those_o insensible_a corpuscle_n which_o daily_o produce_v such_o considerable_a effect_n in_o the_o generation_n and_o corruption_n of_o body_n about_o we_o nay_o may_v not_o such_o microscope_n hazard_v the_o discovery_n of_o the_o aerial_a genii_n and_o present_v even_a spirituality_n themselves_o to_o our_o view_n but_o though_o both_o our_o natural_a and_o artificial_a eye_n fail_v in_o this_o performance_n yet_o have_v we_o another_o more_o intrinsic_a eye_n that_o will_v yet_o discover_v their_o materiality_n and_o that_o be_v the_o pierce_a eye_n of_o reason_n for_o 1._o that_o the_o magnetical_a emission_n and_o fluor_n be_v not_o bare_a quality_n but_o indeed_o corporeal_a atom_n be_v deducible_a from_o hence_o that_o this_o virtue_n decay_v in_o progress_n of_o time_n as_o all_o odour_n do_v and_o be_v total_o destroy_v by_o fire_n 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itself_o be_v make_v red_a hot_a in_o the_o fire_n it_o not_o only_o amit_v the_o magnetical_a vigour_n it_o have_v in_o itself_o before_o but_o acquire_v a_o new_a one_o according_a to_o the_o positional_a law_n in_o its_o refrigeration_n so_o that_o by_o invert_v the_o extreme_n as_o it_o come_v out_o of_o the_o fire_n you_o may_v alter_v the_o pole_n thereof_o at_o pleasure_n nay_o you_o may_v change_v the_o polarity_n of_o many_o feeble_a stone_n by_o a_o long_a position_n in_o a_o contrary_a posture_n to_o that_o which_o it_o natural_o affect_v both_o which_o experiment_n seem_v to_o show_v that_o the_o magnetical_a effluvium_n be_v not_o innate_a and_o congenial_a to_o the_o stone_n but_o proceed_v ab_fw-la extrinseco_fw-la etc._n etc._n therefore_o do_v impregnate_n the_o stone_n again_o upon_o their_o readmission_n or_o do_v change_v its_o polarity_n as_o the_o more_o powerful_a stream_n of_o atom_n do_v prevail_v the_o like_a experiment_n if_o it_o can_v be_v try_v will_v 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make_v any_o return_n again_o to_o the_o body_n from_o whence_o they_o proceed_v so_o that_o in_o time_n they_o do_v not_o only_o spend_v their_o quintessential_a and_o fine_a particle_n but_o even_o their_o whole_a bulk_n and_o substance_n as_o be_v ocular_o manifest_a in_o camphire_n now_o it_o be_v not_o so_o in_o magnetical_a body_n who_o exspiration_n be_v continual_a and_o permanent_a because_o they_o return_v in_o circumgyration_n to_o their_o body_n again_o argument_n 5._o if_o the_o magnetic_a ray_n proceed_v intrinsical_o from_o the_o stone_n there_o be_v most_o reason_n they_o shall_v proceed_v from_o the_o centre_n the_o stone_n be_v all_o of_o a_o uniform_a substance_n as_o the_o luminous_a ray_n do_v from_o the_o body_n of_o the_o sun_n and_o as_o odour_n do_v from_o their_o original_a and_o so_o there_o will_v be_v no_o pole_n nor_o inclination_n of_o magnet_n more_o in_o one_o latitude_n than_o in_o another_o but_o now_o since_o there_o be_v two_o pole_n where_o the_o current_n of_o effluxion_n be_v strong_a it_o be_v a_o sign_n the_o magnetical_a fluor_n come_v from_o without_o do_v strike_v a_o stream_n in_o at_o one_o pole_n and_o find_v the_o grain_n and_o bait_n of_o the_o stone_n to_o lie_v fit_a for_o their_o tranation_n do_v channel_n through_o to_o the_o opposite_a part_n of_o the_o stone_n and_o so_o continue_v their_o current_n in_o the_o air_n so_o far_o till_o they_o be_v resist_v and_o force_v to_o recoil_v by_o a_o double_a whirlpool-motion_n round_o about_o into_o the_o magnet_n again_o argument_n 6._o that_o the_o magnetic_a fluor_n proceed_v not_o intrinsical_o from_o the_o stone_n to_o cause_v the_o self-direction_n in_o the_o magnet_n be_v further_a evident_a from_o this_o new_a experiment_n take_v a_o wedge_n of_o iron_n which_o the_o smith_n call_v puncheon_n and_o heat_n it_o red-hot_a you_o shall_v according_a to_o the_o law_n in_o its_o refrigeration_n endue_v it_o with_o a_o polary_a verticity_n as_o have_v be_v praeobserved_a by_o all_o magnetic_a writer_n but_o that_o which_o will_v heighten_v the_o experiment_n further_o be_v that_o though_o it_o have_v but_o acquire_v a_o feeble_a virtue_n by_o its_o refrigeration_n yet_o if_o you_o take_v it_o up_o cold_a and_o with_o a_o few_o smart_a stroke_n of_o a_o great_a mall_n or_o hammer_n you_o beat_v the_o one_o end_n of_o it_o set_v the_o other_o against_o some_o hard_a resist_a matter_n as_o stone_n brass_n iron_n or_o hard_a wood_n you_o shall_v thereby_o give_v it_o a_o most_o powerful_a magnetisme_n so_o that_o it_o will_v then_o as_o active_o move_v the_o needle_n at_o a_o good_a distance_n as_o the_o loadstone_n itself_o now_o say_v i_o by_o those_o percussion_n you_o do_v so_o open_a and_o relax_v the_o pore_n in_o the_o iron-wedge_n that_o the_o magnetical_a atom_n can_v then_o enter_v in_o with_o a_o full_a career_n which_o before_o they_o can_v not_o and_o have_v once_o get_v so_o free_a a_o passage_n they_o will_v maintain_v the_o
be_v but_o gratìs_fw-la dictum_fw-la and_o which_o he_o neither_o have_v nor_o all_o the_o peripatetic_n in_o the_o world_n can_v ever_o prove_v let_v we_o first_o see_v he_o do_v that_o and_o then_o you_o shall_v see_v what_o i_o be_o able_a to_o say_v to_o it_o chap._n v._n and_o now_o i_o come_v to_o his_o three_o great_a invention_n and_o the_o first_o shall_v be_v of_o longitude_n to_o find_v the_o longitude_n of_o any_o place_n or_o some_o thing_n aequipollent_a thereunto_o be_v easy_o do_v say_v he_o from_o these_o three_o data_fw-la that_o be_v the_o angle_n of_o magnetical_a inclination_n magnetical_a variation_n elevation_n of_o the_o pole_n as_o for_o example_n at_o roven_n in_o france_n the_o angle_n of_o north-easting_a variation_n of_o the_o compass_n be_v 2_o gr_n 30_o '_o the_o angle_n of_o septentrional_a inclination_n be_v 72_o gr_n the_o elevation_n of_o the_o north-pole_n there_o be_v 49_o gr_n grandamicus_n his_o consequence_n from_o hence_o now_o it_o be_v 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be_v very_o probable_a it_o will_v come_v to_o a_o exact_a meridionality_n and_o perchance_o veer_v as_o much_o on_o the_o other_o side_n of_o the_o meridian_n line_n viz_o westward_n as_o it_o have_v do_v of_o this_o doctor_n croone_a my_o worthy_a and_o most_o ingenious_a friend_n write_v i_o word_n that_o in_o june_n last_o 1661._o the_o magnetical_a variation_n at_o london_n be_v find_v to_o be_v by_o the_o best_a observation_n 45′_n 30″_n westward_n so_o that_o it_o seem_v it_o have_v pass_v the_o meridian_n already_o and_o of_o this_o mystery_n of_o the_o variation_n of_o the_o variation_n grandamicus_n himself_o be_v not_o ignorant_a but_o because_o it_o will_v spoil_v his_o glorious_a invention_n he_o therefore_o unhandsome_o and_o unworthy_o asperse_v our_o english_a observation_n with_o ignorance_n error_n and_o incertitude_n cap._n 4._o pag._n 73._o whereas_o the_o observator_n nominate_v be_v of_o that_o knowledge_n and_o perspicacity_n in_o the_o mathematics_n that_o i_o be_o sure_a it_o be_v a_o credit_n to_o grandamicus_n to_o be_v inferior_a to_o any_o of_o they_o but_o we_o shall_v now_o tell_v he_o that_o not_o only_o the_o english_a but_o his_o own_o countryman_n have_v find_v out_o this_o truth_n so_o that_o the_o like_a decrease_n of_o the_o needle_n be_v variation_n have_v be_v observe_v at_o paris_n by_o mersennus_n and_o at_o aix_n by_o gassendus_fw-la so_o than_o this_o angle_n of_o variation_n be_v quite_o fallible_a and_o always_o variable_a his_o other_o two_o angle_n will_v prove_v nothing_o at_o all_o for_o they_o be_v the_o same_o in_o the_o same_o latitude_n or_o parallel_n round_o about_o the_o earth_n 2._o but_o grant_v he_o his_o three_o data_fw-la i_o say_v in_o the_o opposite_a point_n of_o the_o globe_n that_o be_v antipode_n to_o roven_n all_o these_o three_o angle_n be_v the_o same_o if_o you_o reply_v and_o say_v that_o though_o the_o angle_n of_o variation_n and_o inclination_n be_v the_o same_o yet_o they_o will_v be_v point_v out_o by_o the_o opposite_a point_n of_o the_o directory_n and_o inclinatory_a needle_n to_o which_o we_o counter-rep_o that_o the_o same_o point_n of_o the_o needle_n that_o point_v at_o the_o north-pole_n here_o will_v there_o point_v at_o the_o south-pole_n therefore_o he_o can_v have_v no_o evidence_n of_o the_o needle_n of_o variation_n as_o be_v manifest_a by_o carry_v the_o needle_n from_o the_o one_o pole_n of_o the_o terrella_n to_o the_o other_o and_o for_o the_o inclinatory_a needle_n we_o see_v what_o a_o ticklish_a thing_n it_o be_v to_o make_v exact_o and_o though_o it_o be_v poize_v by_o a_o good_a artificer_n yet_o will_v it_o miss_v one_o or_o more_o degree_n in_o hit_v the_o true_a point_n of_o inclination_n which_o will_v be_v a_o considerable_a error_n to_o a_o land-traveller_n at_o least_o 3._o for_o the_o profit_n and_o utility_n of_o this_o invention_n it_o be_v none_o at_o all_o for_o to_o a_o traveller_n that_o sail_v in_o one_o and_o the_o same_o parallel_n which_o he_o may_v do_v many_o a_o thousand_o mile_n the_o angle_n of_o inclination_n and_o elevation_n will_v remain_v the_o same_o with_o those_o at_o the_o port_n from_o whence_o he_o set_v sail_n and_o though_o the_o angle_n of_o variation_n do_v alter_v as_o he_o will_v have_v it_o yet_o my_o mariner_n can_v tell_v nothing_o at_o all_o thereby_o but_o only_o thus_o that_o he_o be_v not_o at_o roven_n but_o how_o far_o he_o be_v go_v from_o it_o either_o east_n or_o west_n he_o know_v not_o at_o all_o unless_o he_o foreknow_v the_o angle_n of_o variation_n in_o every_o longitude_n which_o be_v yet_o unknown_a and_o if_o they_o be_v all_o now_o know_v yet_o be_v it_o of_o little_a or_o no_o use_n or_o benefit_n because_o in_o process_n of_o time_n the_o variation_n itself_o vary_v as_o we_o have_v pre-observed_n chap._n vi_o and_o now_o we_o come_v to_o his_o second_o great_a invention_n with_o which_o he_o thunder_v against_o the_o copernican_n and_o that_o be_v his_o great_a magnetical_a experiment_n to_o avouch_v the_o earth_n immobability_n to_o this_o experiment_n therefore_o draw_v from_o the_o perpendicular_a position_n of_o the_o magnet_n we_o answer_v that_o the_o reason_n why_o the_o terrella_n do_v wheel_n about_o and_o direct_v certain_a part_n of_o its_o aequator_fw-la to_o certain_a and_o determinate_a point_n of_o the_o horizon_n be_v because_o it_o be_v overpower_v by_o the_o magnetical_a effluxion_n of_o the_o earth_n which_o as_o a_o great_a magnet_n do_v violent_o reduce_v it_o to_o that_o situation_n which_o probable_o be_v the_o same_o that_o those_o aequatorial_n part_v have_v in_o their_o mineral_n bed_n and_o therefore_o this_o great_a argument_n against_o the_o dinetical_a motion_n of_o the_o earth_n be_v no_o argument_n at_o all_o unless_o that_o he_o can_v prove_v to_o we_o that_o the_o terrella_n can_v play_v this_o trick_n it_o be_v remove_v out_o of_o the_o sphere_n of_o the_o earth_n magnetisme_n which_o be_v beyond_o his_o philosophy_n ever_o to_o demonstrate_v 2._o again_o if_o this_o motion_n of_o the_o magnet_n do_v proceed_v from_o a_o intrinsecal_n tendency_n that_o it_o have_v of_o its_o own_o to_o bring_v all_o its_o part_n to_o their_o right_n and_o determinate_a point_n there_o to_o remain_v in_o a_o perfect_a stability_n then_o will_v those_o part_n constant_o affect_v this_o and_o no_o other_o situation_n howsoever_o the_o loadstone_n be_v posit_v provide_v it_o be_v at_o liberty_n to_o move_v itself_o to_o its_o desire_a position_n but_o this_o be_v false_a for_o in_o grandamicus_n his_o experiment_n if_o you_o invert_v the_o pole_n of_o the_o magnet_n and_o set_v the_o north-pole_n in_o the_o zenith_n and_o the_o south_n in_o the_o nadir_n you_o shall_v see_v the_o stone_n to_o counterchange_n its_o situation_n and_o those_o aequatorial_n part_n of_o the_o magnet_n which_o before_o respect_v the_o east_n shall_v now_o wheel_v about_o and_o fix_v themselves_o in_o the_o west_n and_o the_o northern_a part_n turn_v to_o the_o south_n which_o show_v that_o the_o stone_n do_v not_o tack_v about_o from_o a_o intrinsical_a principle_n and_o form_n of_o its_o own_o but_o be_v turn_v by_o the_o extrinsical_a effluxion_n of_o the_o whole_a earth_n or_o rather_o by_o the_o stream_n of_o those_o magnetical_a atom_n that_o strike_v not_o only_o through_o the_o axis_n of_o the_o earth_n but_o also_o through_o the_o body_n of_o every_o petty_a loadstone_n according_o as_o they_o be_v best_a receive_v by_o the_o grain_n or_o bait_n of_o the_o say_a stone_n and_o now_o i_o be_o engage_v in_o this_o magnetic_a discourse_n i_o must_v tell_v you_o that_o i_o think_v our_o famous_a gilbert_n have_v draw_v a_o more_o prevalent_a argument_n from_o this_o magnetical_a philosophy_n to_o prove_v the_o earth_n motion_n by_o than_o grandamicus_n have_v do_v to_o destroy_v it_o for_o since_o it_o be_v
viz_o a_o perpetual_a motion_n for_o the_o demonstrate_v of_o which_o he_o devise_v this_o follow_a experiment_n m_o r._n charles_n townley_n his_o experiment_n from_o which_o he_o will_v deduce_v a_o perpetual_a motion_n let_v the_o glass_n def_n be_v fill_v with_o two_o several_a liquor_n so_o as_o they_o may_v remain_v in_o two_o distinct_a region_n one_o above_o another_o as_o ab_fw-la without_o the_o least_o mixture_n which_o may_v be_v perform_v in_o milk_n and_o water_n place_v a_o broad_a piece_n of_o cork_n or_o bread_n that_o will_v swim_v so_o upon_o the_o milk_n which_o must_v be_v the_o low_a as_o a_o be_v heavy_a than_o water_n that_o it_o may_v receive_v the_o force_n of_o the_o water_n fall_n when_o you_o pour_v it_o upon_o the_o milk_n this_o do_v and_o the_o cork_n or_o bread_n be_v take_v out_o hang_v the_o syphon_n acb_n first_o fill_v with_o milk_n upon_o the_o stick_n dce_n so_o artificial_o that_o the_o long_o end_v a_o may_v remain_v in_o the_o region_n of_o 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contrary_n to_o mr._n charles_n his_o prognostic_n the_o water_n do_v not_o rise_v up_o the_o short_a shank_n and_o drive_v back_o the_o milk_n but_o quiet_o permit_v the_o milk_n to_o drill_v through_o it_o though_o i_o know_v it_o be_v not_o material_a which_o way_n the_o flux_n be_v perform_v provide_v it_o will_v have_v be_v perpetual_a the_o experiment_n fail_v in_o these_o two_o liquor_n we_o attempt_v the_o same_o again_o in_o other_o two_o liquor_n which_o we_o be_v sure_a will_v not_o mix_v and_o to_o that_o purpose_n we_o fill_v the_o aforesaid_a glass_n with_o oil_n of_o tartar_n per_fw-la deliquium_fw-la and_o spirit_n of_o wine_n which_o we_o tinged_a yellow_a with_o saffron_n the_o better_a to_o distinguish_v the_o liquor_n and_o then_o adapt_a the_o syphon_n as_o before_o we_o wish_v for_o a_o happy_a event_n in_o the_o experiment_n but_o experience_n which_o ought_v to_o be_v the_o mistress_n of_o wise_a man_n as_o well_o as_o fool_n show_v we_o the_o quite_o contrary_a for_o the_o syphon_n will_v not_o run_v at_o all_o but_o continue_v full_a which_o we_o afterward_o conjecture_v to_o proceed_v from_o the_o heterogeneity_n of_o the_o two_o liquor_n so_o that_o the_o oil_n of_o tartar_n will_v not_o break_v out_o into_o the_o spirit_n of_o wine_n no_o more_o than_o milk_n or_o water_n will_v do_v into_o the_o open_a air_n where_o the_o pendent_a shank_n be_v short_a than_o the_o standard-height_n of_o those_o two_o liquor_n so_o that_o it_o seem_v to_o effect_v this_o experiment_n indeed_o two_o such_o liquor_n must_v be_v find_v out_o as_o be_v in_o some_o wise_a homogeneous_a and_o of_o a_o congruity_n and_o the_o one_o considerable_o light_a than_o the_o other_o which_o be_v tantùm_fw-la non_fw-la impossibile_fw-it for_o beside_o the_o former_a liquor_n we_o have_v try_v oil_n and_o water_n and_o no_o motion_n at_o all_o be_v perceive_v for_o the_o same_o reason_n of_o incongruity_n former_o deliver_v but_o these_o and_o a_o hundred_o more_o experiment_n of_o this_o nature_n be_v every_o day_n excogitated_a and_o try_v by_o our_o noble_a society_n of_o gresham-colledge_n which_o in_o a_o little_a time_n will_v be_v improve_v into_o far_o noble_a consequence_n and_o theory_n than_o can_v possible_o be_v do_v by_o the_o single_a endeavour_n of_o any_o person_n whatsoever_o the_o end_n of_o the_o mercurial_a experiment_n experimental_a philosophy_n the_o three_o book_n contain_v experiment_n magnetical_a with_o a_o confutation_n of_o grandamicus_n amicus_fw-la plato_n amicus_fw-la aristoteles_n grandis_fw-la amicus_fw-la grandamicus_n sed_fw-la magis_fw-la amica_fw-la veritas_fw-la by_o henry_n power_n d_o r._n of_o physic_n london_n print_v in_o the_o year_n 1663._o a_o confutation_n of_o grandamicus_n his_o magnetical_a tractate_n de_fw-fr immobilitate_fw-la terrae_fw-la the_o three_o book_n chap._n i._n the_o three_o great_a demonstration_n and_o magnetical_a discovery_n that_o this_o author_n so_o glorious_o pretend_v to_o be_v 1._o a_o magnetical_a demonstration_n of_o the_o earth_n immobility_n 2._o a_o universal_a meridian_n magnetical_o demonstrate_v 3._o a_o magnetical_a discovery_n of_o longitude_n or_o something_o equivalent_a thereunto_o in_o the_o canvas_n of_o these_o three_o great_a discovery_n we_o shall_v invert_v the_o order_n and_o begin_v with_o the_o last_o first_o but_o before_o we_o can_v convenient_o fasten_v upon_o these_o three_o main_a pillar_n of_o his_o book_n there_o be_v three_o other_o considerable_a error_n of_o he_o first_o to_o be_v remove_v which_o though_o they_o lie_v more_o obscure_a and_o remove_v from_o our_o sight_n and_o bury_v as_o it_o be_v under_o ground_n yet_o indeed_o be_v they_o the_o basis_n and_o foundation_n upon_o which_o his_o magnificent_a structure_n be_v build_v and_o they_o be_v these_o position_n follow_v 1._o that_o the_o virtue_n of_o the_o magnet_n and_o all_o magnetic_a body_n be_v pure_o immaterial_a and_o a_o bare_a simple_a quality_n 2._o that_o it_o proceed_v intrinsical_o from_o the_o proper_a form_n of_o the_o loadstone_n as_o he_o have_v deliver_v cap._n 3._o pag._n 48._o 3._o that_o all_o the_o world_n and_o consequent_o all_o the_o body_n therein_o be_v make_v by_o the_o divine_a providence_n for_o the_o use_n of_o we_o and_o our_o habitation_n this_o globe_n of_o earth_n which_o he_o have_v fix_v in_o the_o centre_n of_o the_o world_n and_o constitute_v we_o lord_n and_o master_n of_o all_o the_o universe_n grand_fw-fr pag._n 50._o chap._n ii_o of_o the_o corporeal_a effluvium_n of_o the_o loadstone_n doctor_n highmore_n tell_v we_o that_o the_o magnetical_a exspiration_n of_o the_o loadstone_n may_v be_v discover_v by_o the_o help_n of_o glass_n and_o be_v see_v in_o the_o form_n of_o a_o mist_n to_o flow_v from_o the_o loadstone_n this_o indeed_o will_v be_v a_o incomparable_a eviction_n of_o the_o corporeity_n of_o magnetical_a effluvium_n and_o sensible_o decide_v the_o controversy_n under_o consideration_n but_o i_o be_o sure_a he_o have_v either_o better_a eye_n or_o else_o better_a glass_n than_o ever_o i_o see_v though_o i_o have_v look_v through_o as_o good_a as_o england_n afford_v and_o the_o best_a of_o they_o all_o be_v as_o far_o from_o present_v these_o subtle_a emanation_n that_o they_o will_v never_o exhibit_v to_o i_o those_o grosser_n and_o far_o more_o material_a effluvium_n from_o electrical_a and_o aromatical_a body_n nay_o not_o the_o evaporation_n of_o camphire_n which_o spend_v itself_o by_o continual_o effluviate_a its_o own_o component_a particle_n nay_o i_o can_v never_o see_v the_o grosser_n steam_n that_o continual_o transpire_v out_o of_o our_o own_o body_n and_o be_v the_o fuliginous_a eructation_n of_o that_o internal_a fire_n which_o constant_o burn_v within_o we_o indeed_o if_o our_o dioptric_n can_v attain_v to_o that_o curiosity_n as_o to_o grind_v we_o such_o glass_n as_o will_v present_v the_o effluvium_n
demonstrate_v of_o late_a that_o all_o the_o whole_a earth_n be_v nothing_o but_o a_o great_a and_o globular_a loadstone_n and_o that_o all_o the_o circle_n of_o the_o armillary_n sphere_n be_v real_o true_o and_o natural_o inhaerent_a in_o the_o earth_n by_o virtue_n of_o the_o transcurrent_fw-la atom_n how_o can_v we_o conclude_v otherwise_o but_o with_o gilbert_n quis_fw-la in_o posterum_fw-la eum_fw-la de_fw-la facto_fw-la moveri_fw-la dubitabit_fw-la quum_fw-la ei_fw-la omne_fw-la ad_fw-la motum_fw-la planè_fw-la requisita_fw-la dedit_fw-la natura_fw-la i._n e._n figuram_fw-la rotundam_fw-la pendulam_fw-la in_o medio_fw-la fluido_fw-la positionem_fw-la &_o omnes_fw-la terminos_fw-la motui_fw-la circulari_fw-la inservientes_fw-la polos_fw-la nempè_fw-la aequatorem_fw-la meridianos_fw-la &_o polares_fw-la circulos_fw-la &_o parallelos_fw-la last_o as_o for_o his_o universal_a meridian_n it_o be_v likewise_o deduce_v from_o his_o anti_fw-la copernican_n experiment_n of_o the_o loadstone_n swim_v in_o a_o boat_n with_o its_o pole_n vertical_o erect_v for_o say_v he_o since_o the_o stone_n be_v horizontally-placed_n do_v not_o show_v the_o true_a meridian_n but_o with_o a_o angle_n of_o variation_n in_o most_o if_o not_o in_o all_o place_n of_o the_o earth_n if_o you_o set_v it_o with_o its_o axis_n perpendicular_a as_o before_o it_o will_v after_o some_o undulation_n to_o and_o fro_o rest_v quiet_o with_o certain_a part_n face_v the_o meridian_n which_o point_n must_v be_v exact_o mark_v and_o through_o they_o a_o circle_n draw_v round_o about_o the_o stone_n by_o help_n of_o which_o you_o may_v strike_v a_o true_a meridian-line_n when_o and_o where_o you_o please_v now_o though_o we_o grant_v this_o experiment_n to_o be_v true_a and_o probable_o to_o hold_v good_a in_o all_o longitude_n and_o latitude_n yet_o he_o that_o shall_v perpend_v how_o many_o ticklish_a curiosity_n and_o nice_a circumstance_n there_o be_v to_o perform_v this_o experiment_n exact_o will_v find_v the_o invention_n only_o please_v in_o the_o theory_n but_o not_o in_o the_o practice_n for_o 1._o it_o be_v very_o difficult_a to_o place_v the_o terrella_n in_o a_o exact_a perpendicular_a 2._o when_o it_o be_v so_o it_o be_v as_o difficult_a to_o keep_v it_o invariable_a under_o the_o same_o zenith_n 3._o most_o difficult_a to_o draw_v a_o exact_a meridian-line_n from_o it_o not_o to_o mention_v how_o hard_o a_o thing_n it_o be_v first_o to_o find_v the_o two_o polary_a point_n in_o a_o globe-loadstone_n also_o to_o keep_v the_o boat_n in_o a_o fluctuation_n parallel_n to_o the_o horizon_n the_o end_n of_o magnetical_a experiment_n subterraneous_a experiment_n or_o observation_n about_o cole-mine_n by_o henry_n power_n m_o ae_z d_o r._n a_o the_o coalpit_n b_o the_o vent-pit_n cc_o the_o sow_n that_o drain_v all_o the_o head_n from_o water_n ddd_n etc._n etc._n the_o vent-head_n not_o above_o two_o yard_n broad_a eeee_o the_o lateral_a head_n which_o be_v not_o above_o 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we_o see_v that_o the_o external_n and_o internal_a air_n be_v come_v to_o the_o same_o temper_n and_o elasticity_n then_o carry_v the_o weatherglass_n so_o prepare_v in_o a_o scoop_v down_o to_o the_o bottom_n of_o the_o coalpit_n which_o be_v not_o above_o 35._o yard_n deep_a there_o the_o water_n in_o the_o weatherglass_n do_v rise_v up_o to_o the_o point_n d_o viz._n very_o near_o 3._o inch_n high_o than_o its_o former_a standard_n c._n experiment_n 2._o the_o six_o day_n of_o november_n 1662._o we_o repeat_v the_o same_o experiment_n as_o before_o in_o a_o pit_n of_o 68_o yard_n deep_a and_o there_o we_o find_v that_o at_o the_o bottom_n of_o the_o say_a pit_n the_o water_n in_o the_o weatherglass_n do_v rise_v very_o near_o four_o inch_n high_o than_o the_o point_n c_o viz._n one_o inch_n high_o than_o the_o point_n d_o to_o f._n now_o we_o observe_v that_o in_o carry_v down_o of_o the_o say_a glass_n in_o a_o scoop_v from_o the_o top_n to_o the_o middle_n of_o the_o pit_n there_o the_o water_n do_v not_o rise_v so_o much_o as_o it_o do_v from_o the_o middle_n to_o the_o bottom_n by_o half_a a_o inch_n so_o that_o it_o seem_v the_o rise_n of_o the_o water_n be_v not_o proportional_a to_o the_o glasse_n descent_n in_o the_o pit_n experiment_n 3._o we_o take_v a_o very_a good_a arm_a loadstone_n of_o a_o oval_a figure_n who_o pole_n lay_v in_o the_o long_a diameter_n and_o at_o the_o top_n of_o the_o coal-pit_n we_o load_v the_o north-pole_n of_o it_o with_o the_o great_a weight_n it_o be_v able_a to_o carry_v even_o to_o a_o scruple_n then_o take_v the_o stone_n down_o to_o the_o bottom_n of_o the_o pit_n and_o hang_v on_o the_o same_o weight_n again_o we_o can_v perceive_v no_o difference_n in_o the_o power_n of_o the_o stone_n at_o the_o one_o place_n from_o the_o other_o for_o it_o will_v neither_o lift_v more_o nor_o less_o there_o than_o above_o though_o to_o try_v this_o experiment_n precise_o and_o to_o minute_n weight_n be_v very_o ticklish_a for_o the_o same_o stone_n in_o any_o place_n will_v sometime_o lift_v a_o little_a more_o and_o sometime_o a_o little_a less_o experiment_n 4._o we_o take_v a_o thread_n of_o 68_o yard_n long_a which_o be_v as_o long_o as_o the_o deep_a pit_n be_v with_o we_o and_o fasten_v a_o brass_n lump_n of_o a_o exact_a pound_n weight_n to_o it_o we_o counterpoise_v both_o it_o and_o the_o thread_n with_o a_o weight_n in_o the_o other_o scale_n then_o fasten_v the_o other_o end_n of_o the_o thread_n to_o one_o of_o the_o scale_n we_o let_v down_o the_o pendent_a weight_n near_o to_o the_o bottom_n and_o there_o we_o find_v it_o to_o weigh_v light_a by_o a_o ounce_n at_o least_o than_o it_o do_v at_o the_o top_n of_o the_o say_a pit_n we_o have_v try_v this_o with_o a_o bladder_n full_a of_o water_n and_o other_o substance_n also_o but_o that_o our_o thread_n by_o often_o untwine_a break_v itself_o experiment_n 5._o the_o collier_n tell_v we_o that_o if_o a_o pistol_n be_v shoot_v off_o in_o a_o head_n remote_a from_o the_o eye_n of_o a_o pit_n it_o will_v give_v but_o a_o little_a report_n or_o rather_o a_o sudden_a thump_n like_o a_o gun_n shoot_v off_o at_o a_o great_a distance_n but_o if_o it_o be_v discharge_v at_o the_o eye_n of_o the_o pit_n in_o the_o bottom_n it_o will_v make_v a_o great_a noise_n than_o if_o shoot_v off_o aboveground_o but_o these_o experiment_n be_v of_o a_o dangerous_a trial_n in_o our_o pit_n and_o the_o collier_n dare_v not_o attempt_v they_o by_o reason_n of_o the_o craziness_n of_o the_o roof_n of_o their_o work_n which_o often_o fall_v in_o of_o its_o own_o accord_n without_o any_o concussion_n at_o all_o every_o coalpit_n have_v its_o vent-pit_n dig_v down_o at_o a_o competent_a distance_n from_o it_o as_o 50._o or_o 80._o pace_n one_o from_o another_o they_o dig_v a_o vault_n underground_o from_o one_o pit_n to_o another_o which_o they_o call_v the_o vent-pit_n that_o the_o air_n may_v have_v a_o free_a passage_n from_o the_o one_o pit_n 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