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this_o turning-key_n and_o the_o other_o to_o the_o uppermost_a marble_n and_o which_o string_n pass_v through_o the_o crank_n or_o hook_n belong_v to_o the_o brass-cove_a we_o do_v i_o say_v by_o the_o help_n of_o this_o string_n and_o by_o turn_v round_o the_o key_n draw_v up_o the_o superior_a marble_n and_o by_o reason_n of_o their_o coherence_n the_o lowermost_a also_o together_o with_o the_o weight_n that_o hang_v at_o it_o by_o which_o mean_v be_v sure_a that_o the_o two_o marble_n stick_v close_o together_o we_o begin_v to_o pump_v out_o the_o air_n that_o keep_v they_o coherent_a and_o after_o a_o while_n the_o air_n be_v pretty_a well_o withdraw_v the_o marble_n fall_v asunder_o but_o we_o have_v so_o order_v the_o matter_n that_o the_o lowermost_a can_v fall_v but_o a_o little_a way_n beneath_o the_o other_o we_o be_v able_a by_o incline_v and_o shake_v the_o engine_n to_o place_v they_o one_o upon_o another_o again_o and_o then_o let_v in_o the_o air_n somewhat_o hasty_o 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they_o can_v see_v if_o not_o also_o touch_v and_o handle_v and_o as_o soon_o as_o they_o meet_v with_o a_o effect_n that_o they_o can_v ascribe_v to_o some_o palpable_a or_o at_o least_o sensible_a efficient_a they_o be_v and_o stick_v not_o to_o confess_v themselves_o utter_o at_o a_o loss_n and_o though_o the_o vulgar_a of_o philosopher_n will_v not_o acknowledge_v themselves_o to_o be_v pose_v by_o the_o same_o phaenomena_fw-la with_o the_o vulgar_a of_o man_n yet_o in_o effect_n they_o be_v so_o but_o the_o school-philosopher_n on_o the_o contrary_a do_v not_o only_o refuse_v to_o acquiesce_v in_o sensible_a agent_n but_o to_o solve_v the_o more_o mysterious_a phaenomena_n of_o nature_n nay_o and_o most_o of_o the_o familiar_a one_o too_o they_o scruple_n not_o to_o run_v too_o far_o to_o the_o other_o side_n and_o have_v their_o recourse_n to_o agent_n that_o be_v not_o only_o invisible_a but_o inconceivable_a at_o least_o to_o man_n that_o can_v admit_v any_o save_v rational_a and_o consistent_a nation_n they_o ascribe_v all_o abstruse_a effect_n to_o certain_a substantial_a form_n which_o however_o they_o call_v material_a because_o of_o their_o dependence_n on_o matter_n they_o give_v such_o description_n to_o as_o belong_v but_o to_o spiritual_a being_n as_o if_o all_o the_o abstruser_n effect_n of_o nature_n if_o they_o be_v not_o perform_v by_o visible_a body_n must_v be_v so_o by_o immaterial_a substance_n whereas_o betwixt_o visible_a body_n and_o spiritual_a being_n there_o be_v a_o middle_a sort_n of_o agent_n invisible_a corpuscle_n by_o which_o a_o great_a part_n of_o the_o difficulter_n phaenomena_fw-la of_o nature_n be_v produce_v and_o by_o which_o may_v intelligible_o be_v explicate_v those_o phaenomena_n which_o it_o be_v absurd_a to_o refer_v to_o the_o former_a and_o precarious_a to_o attribute_v to_o the_o latter_a now_o for_o method_n sake_n i_o will_v refer_v the_o note_n that_o occur_v to_o i_o
be_v not_o require_v the_o engine_n shall_v be_v very_o much_o exhaust_v 58._o 59_o experiment_n 18._o about_o a_o easy_a way_n to_o make_v the_o pressure_n of_o the_o air_n sensible_a to_o the_o touch_n of_o those_o that_o doubt_v of_o it_o 59_o with_o a_o caution_n in_o use_v of_o it_o 61_o experiment_n 19_o about_o the_o subsidence_n of_o mercury_n in_o the_o tube_n of_o the_o torricellian_a experiment_n to_o the_o level_n of_o the_o stagnant_a mercury_n 61_o some_o confirmation_n of_o what_o have_v be_v say_v in_o the_o first_o treatise_n of_o the_o physicomechanical_a experiment_n exp._n 17._o 62._o 63_o experiment_n 20._o show_v that_o in_o tubes_n open_a at_o both_o end_n when_o no_o fuga_fw-la vacui_fw-la can_v be_v pretend_v the_o weight_n of_o water_n will_v raise_v quicksilver_n no_o high_o in_o slender_a than_o in_o large_a pipe_n 63_o two_o trial_n one_o with_o tube_n of_o several_a bigness_n open_a at_o both_o end_n 64._o 65._o the_o other_o with_o they_o after_o the_o torricellian_a way_n 65._o 66_o experiment_n 21._o of_o the_o height_n at_o which_o pure_a mercury_n and_o mercury_n amalgame_v with_o tin_n will_v stand_v in_o barometer_n 66_o a_o note_n concern_v the_o inconvenience_n if_o the_o amalgam_n be_v too_o thick_a the_o use_n that_o may_v be_v make_v of_o this_o experiment_n to_o discover_v how_o much_o two_o mix_v body_n penetrate_v one_o another_o as_o also_o to_o further_o illustrate_v that_o the_o height_n of_o the_o liquor_n in_o the_o torricellian_a experiment_n depend_v upon_o the_o aequilibrium_fw-la with_o the_o outward_a air._n 67_o experiment_n 22._o wherein_o be_v propose_v away_o of_o make_v barometer_n that_o may_v be_v transport_v even_o to_o distant_a country_n 68_o the_o figure_n the_o barometer_n be_v to_o be_v of_o the_o way_n of_o fill_v it_o put_v it_o into_o a_o frame_n and_o secure_v it_o from_o the_o harm_n the_o mercury_n its_o self_n may_v do_v in_o the_o transportation_n by_o its_o move_n up_o and_o down_o in_o the_o upper_a empty_a part_n 69._o 70._o etc._n etc._n the_o great_a serviceableness_n of_o this_o instrument_n with_o a_o intimation_n of_o other_o of_o a_o different_a kind_n 74._o 75_o a_o postscript_n advertise_v that_o there_o have_v be_v since_o some_o difference_n find_v betwixt_o a_o ordinary_a baroscope_n and_o these_o travail_a one_o with_o a_o guess_n at_o the_o reason_n of_o it_o and_o that_o for_o all_o this_o the_o portable_a baroscope_n may_v be_v serviceable_a 76._o 77_o experiment_n 23._o confirm_v that_o mercury_n in_o a_o barometer_n will_v be_v keep_v suspend_v high_a at_o the_o top_n than_o at_o the_o bottom_n of_o a_o hill_n on_o which_o occasion_n something_o be_v note_v about_o the_o height_n of_o mountain_n especial_o the_o picinino_n of_o tenariff_n 77_o other_o author_n opinion_n about_o it_o examine_v 80_o a_o more_o moderate_a height_n allow_v than_o that_o assert_v by_o ricciolus_n 81._o 82._o with_o a_o consideration_n to_o be_v have_v in_o the_o measure_n the_o altitude_n of_o mountain_n distant_a from_o the_o sea_n 84_o experiment_n 24._o show_v that_o the_o pressure_n of_o the_o atmosphere_n may_v be_v exercise_v enough_o to_o keep_v up_o the_o mercury_n in_o the_o torricellian_a experiment_n though_o the_o air_n press_v upon_o it_o at_o a_o very_a small_a orifice_n 85_o experiment_n 25._o show_v that_o a_o oblique_a pressure_n of_o the_o atmosphere_n may_v suffice_v to_o keep_v up_o the_o mercury_n at_o the_o wont_a height_n in_o the_o torricellian_a experiment_n and_o that_o the_o spring_n of_o a_o little_a include_v air_n may_v do_v the_o same_o 87_o what_o use_n may_v be_v make_v of_o the_o former_a experiment_n for_o a_o portable_a baroscope_n 88_o 89_o experiment_n 26._o about_o the_o make_n of_o a_o baroscope_n but_o of_o little_a practical_a use_n that_o serve_v but_o at_o certain_a time_n 90_o the_o argument_n it_o afford_v against_o a_o fuga_fw-la vacui_fw-la ib._n experiment_n 27._o about_o the_o ascension_n of_o liquor_n in_o very_o slender_a pipe_n in_o a_o exhaust_v receiver_n 91_o experiment_n 28._o about_o the_o great_a and_o seem_o spontaneous_a ascension_n of_o water_n in_o a_o pipe_n fill_v with_o a_o compact_a body_n who_o particle_n be_v think_v incapable_a of_o imbibe_v it_o 93_o by_o it_o a_o explication_n that_o have_v be_v make_v of_o the_o cause_n of_o filtration_n examine_v a_o probable_a cause_n of_o the_o ascension_n of_o sap_n into_o tree_n hence_o suggest_v a_o attempt_n to_o make_v a_o syphon_n that_o shall_v run_v of_o itself_o without_o suction_n 95._o 96_o experiment_n 29._o of_o the_o seem_o spontaneous_a ascension_n of_o salt_n along_o the_o side_n of_o glass_n with_o a_o conjecture_n at_o the_o cause_n of_o it_o 97_o experiment_n 30._o about_o a_o attempt_n to_o measure_v the_o gravity_n of_o the_o cylinder_n of_o the_o atmosphere_n so_o as_o that_o it_o may_v be_v express_v by_o know_a and_o common_a weight_n 101_o wherein_o also_o the_o specific_a gravity_n of_o mercury_n and_o water_n be_v compare_v 102_o experiment_n 31._o about_o the_o attractive_a virtue_n of_o the_o loadstone_n in_o a_o exhaust_v receiver_n 105_o experiment_n 32._o show_v that_o when_o the_o pressure_n of_o the_o external_n air_n be_v take_v off_o it_o be_v very_o easy_a to_o draw_v up_o the_o sucker_n of_o a_o syringe_n though_o the_o hole_n at_o which_o the_o air_n or_o water_n shall_v succeed_v be_v stop_v 106_o the_o first_o trial_n 107._o the_o 2_o d_o trial_n contain_v a_o variation_n of_o the_o forego_n 109_o experiment_n 33._o about_o the_o open_n of_o a_o syringe_n who_o pipe_n be_v stop_v in_o the_o exhaust_a receiver_n and_o by_o the_o help_n of_o it_o make_v the_o pressure_n of_o the_o air_n lift_v up_o a_o considerable_a weight_n 111_o experiment_n 34._o show_v that_o the_o cause_n of_o the_o ascension_n of_o liquor_n in_o syringe_n be_v to_o be_v derive_v from_o the_o pressure_n of_o the_o air._n 113_o exemplify_v in_o three_o several_a trial_n 113._o 115._o 117_o experiment_n 35._o show_v that_o upon_o the_o pressure_n of_o the_o air_n depend_v the_o stick_n of_o cupping-glass_n to_o the_o fleshy_a part_n they_o be_v apply_v to_o 118_o experiment_n 36._o about_o the_o make_n without_o heat_n a_o cupping-glass_n to_o lift_v up_o a_o great_a weight_n 122_o experiment_n 37._o show_v that_o bellows_o who_o nose_n be_v very_o well_o stop_v will_v open_v of_o themselves_o when_o the_o pressure_n of_o the_o external_a air_n be_v take_v off_o 124_o experiment_n 38._o about_o a_o attempt_n to_o examine_v the_o motion_n and_o sensibility_n of_o the_o cartesian_a materia_fw-la subtilis_fw-la or_o the_o aether_n with_o a_o pair_n of_o bellows_o make_v of_o a_o bladder_n in_o the_o exhaust_a receiver_n 127_o experiment_n 39_o about_o a_o far_a attempt_n to_o prosecute_v the_o inquiry_n propose_v in_o the_o foregoing_a experiment_n 132_o first_o with_o a_o syringe_n and_o a_o feather_n 132._o 133._o etc._n etc._n then_o with_o a_o syringe_n in_o water_n 136_o if_o there_o be_v a_o aether_n what_o kind_n of_o body_n it_o must_v be_v with_o a_o confirmation_n of_o the_o 34_o the_o experiment_n 138_o experiment_n 40._o about_o the_o fall_n in_o the_o exhaust_a receiver_n of_o a_o light_a body_n fit_v to_o have_v its_o motion_n visible_o vary_v by_o a_o small_a resistance_n of_o the_o air._n 139_o a_o design_n mention_v to_o try_v this_o way_n what_o the_o degree_n of_o celerity_n will_v be_v of_o descend_v body_n in_o a_o exhaust_a receiver_n 141_o a_o caution_n give_v concern_v this_o present_a experiment_n ib._n direction_n give_v which_o way_n to_o lengthen_v receiver_n for_o the_o trial_n of_o this_o and_o other_o experiment_n 142_o experiment_n 41._o about_o the_o propagation_n of_o sound_n in_o the_o exhaust_a receiver_n 143_o a_o contrivance_n describe_v necessary_a for_o this_o and_o divers_a experiment_n 144_o the_o trial_n perform_v by_o it_o 145._o 146_o another_o trial_n with_o a_o alarm_n watch_n 146._o 147_o a_o assertion_n of_o mersennus_n examine_v a_o proposal_n of_o his_o show_v to_o be_v unpracticable_a 148._o 149_o a_o mention_n of_o some_o other_o trial_n design_v concern_v sound_n 149._o 150_o experiment_n 42._o about_o the_o break_n of_o a_o glass-drop_n in_o a_o exhaust_v receiver_n 150_o wherein_o a_o hypothesis_n ascribe_v the_o cause_n of_o the_o break_n of_o they_o to_o the_o force_n of_o the_o external_a air_n be_v examine_v ib._n experiment_n 43._o about_o the_o production_n of_o light_n in_o the_o exhaust_a receiver_n 151_o experiment_n 44._o about_o the_o production_n of_o a_o kind_n of_o halo_n and_o colour_n in_o the_o exhaust_v receiver_n 152_o the_o reason_n of_o it_o propose_v with_o a_o suggestion_n that_o the_o same_o cause_n may_v have_v be_v of_o that_o apparition_n of_o light_n mentionea_fw-la in_o the_o former_o publish_a experiment_n 153._o 154_o experiment_n 45._o about_o the_o production_n of_o heat_n by_o attrition_n
instrument_n as_o a_o baroscope_n you_o need_v but_o heat_n a_o pin_n or_o slender_a wire_n red_a hot_a and_o so_o burn_v a_o hole_n through_o the_o stoppel_n and_o this_o expedient_a which_o i_o can_v not_o convenient_o advertise_v your_o lordship_n of_o soon_o may_v be_v of_o use_v when_o a_o travail_a baroscope_n be_v to_o be_v often_o remove_v because_o have_v once_o stop_v the_o whole_a orifice_n well_o it_o be_v far_o more_o easy_a to_o stop_v and_o open_v a_o pin-hole_n accurate_o than_o to_o close_v and_o unstop_v the_o whole_a orifice_n of_o the_o tube_n note_v i_o endeavour_v to_o confirm_v more_o than_o one_o of_o the_o forego_n particular_n by_o this_o one_o experiment_n have_v cause_v a_o portable_a barometer_n to_o be_v make_v with_o the_o short_a leg_n of_o a_o somewhat_o more_o than_o ordinary_a length_n i_o afterward_o cause_v the_o upper_a part_n of_o this_o leg_n to_o be_v draw_v out_o very_o slender_a as_o in_o this_o 25_o the_o experiment_n and_o last_o i_o cause_v the_o same_o short_a leg_n to_o be_v either_o about_o or_o somewhat_o above_o the_o middle_a bend_a downward_o so_o that_o the_o small_a orifice_n of_o the_o slender_a apex_n point_v towards_o the_o ground_n this_o do_v i_o be_v to_o have_v measure_v the_o height_n of_o the_o suspend_v mercury_n but_o not_o have_v a_o fit_a ruler_n at_o hand_n i_o then_o defer_v and_o afterward_o forget_v to_o do_v it_o but_o i_o remember_v that_o neither_o i_o nor_o some_o other_o verse_v in_o such_o experiment_n to_o who_o i_o show_v it_o take_v any_o notice_n that_o the_o mercury_n be_v less_o high_a than_o in_o ordinary_a barometer_n whence_o it_o be_v conclude_v that_o the_o atmosphere_n can_v exercise_v his_o pressure_n not_o only_o at_o a_o very_a small_a orifice_n which_o in_o our_o experiment_n do_v little_a if_o at_o all_o exceed_v a_o pin-hole_n but_o when_o the_o air_n must_v at_o this_o little_a orifice_n press_v upward_o to_o be_v able_a to_o press_v upon_o the_o surface_n of_o the_o stagnant_a mercury_n experiment_n xxvi_o about_o the_o make_n of_o a_o baroscope_n but_o of_o little_a practical_a use_n that_o serve_v but_o at_o certain_a time_n to_o show_v some_o ingenious_a man_n by_o a_o medium_fw-la that_o have_v not_o hitherto_o that_o i_o know_v of_o be_v make_v use_n of_o that_o the_o not_o subside_v of_o quicksilver_n in_o a_o invert_v tube_n that_o be_v a_o little_o short_a than_o 30_o inch_n or_o thereabouts_o do_v not_o proceed_v from_o such_o a_o fuga_fw-la vacui_fw-la as_o the_o school_n ascribe_v to_o nature_n but_o from_o the_o gravity_n of_o the_o external_a air_n i_o devise_v the_o follow_a experiment_n have_v make_v choice_n of_o a_o time_n when_o it_o appear_v by_o a_o good_a baroscope_n which_o i_o have_v frequent_o consult_v for_o that_o purpose_n that_o the_o atmosphere_n be_v considerable_o heavy_a i_o cause_v galspipe_n hermetical_o seal_v at_o one_o end_n and_o in_o length_n about_o 2_o foot_n and_o a_o half_a to_o be_v fill_v with_o quicksilver_n save_o a_o very_a little_a wherein_o some_o drop_n of_o water_n be_v put_v that_o we_o may_v the_o better_o discern_v the_o bubble_n if_o any_o shall_v be_v leave_v after_o the_o inversion_n of_o the_o tube_n into_o a_o open_a glass_n with_o stagnant_a mercury_n in_o it_o have_v by_o this_o mean_n though_o not_o without_o difficulty_n free_v the_o tube_n from_o bubble_n we_o so_o order_v the_o matter_n that_o the_o quicksilver_n and_o the_o little_a water_n that_o be_v about_o it_o fill_v the_o tube_n exact_o without_o leave_v any_o interval_n that_o we_o can_v discern_v at_o the_o top_n and_o yet_o the_o mercurial_a cylinder_n be_v but_o very_o little_o high_o than_o that_o of_o our_o baroscope_n be_v at_o that_o time_n this_o do_v the_o new_o fill_v pipe_n be_v leave_v erect_v in_o a_o quiet_a place_n where_o the_o liquor_n retain_v their_o former_a height_n for_o divers_a day_n but_o though_o a_o ordinary_a school-philosopher_n will_v confident_o have_v attribute_v this_o sustation_n of_o so_o heavy_a a_o body_n to_o nature_n fear_n of_o admit_v a_o vacuum_n yet_o it_o seem_v that_o either_o she_o be_v not_o always_o equal_o subject_a to_o that_o fear_n or_o some_o other_o cause_n of_o the_o phaenomenon_n must_v be_v assign_v for_o when_o a_o pretty_a while_n after_o i_o have_v observe_v by_o the_o baroscope_n that_o the_o atmosphere_n be_v grow_v much_o light_a than_o before_o repair_v to_o my_o short_a tube_n i_o find_v that_o according_a to_o my_o expectation_n the_o quicksilver_n be_v not_o inconsiderable_o subside_v and_o have_v leave_v a_o cavity_n at_o the_o top_n which_o afterward_o grow_v lesser_a according_a as_o the_o atmosphere_n grow_v heavy_a nb._n 1_o the_o tube_n employ_v about_o this_o experiment_n may_v be_v bring_v to_o the_o requisite_a shortness_n either_o by_o wear_v off_o a_o little_a of_o the_o glass_n at_o the_o orifice_n of_o it_o or_o by_o increase_v the_o height_n of_o the_o stagnant_a mercury_n into_o which_o it_o have_v be_v invert_v 2._o when_o the_o quick_a silver_n in_o our_o short_a tube_n be_v much_o subside_v there_o appear_v in_o the_o water_n that_o swim_v upon_o it_o a_o little_a bubble_n about_o the_o bigness_n of_o a_o small_a pin_n head_n but_z consider_v how_o careful_a we_o have_v be_v to_o free_v the_o tube_n from_o bubble_n before_o we_o set_v it_o to_o rest_n it_o may_v very_o well_o be_v that_o this_o so_o small_a a_o bubble_n be_v not_o produce_v till_o after_o the_o subside_v of_o the_o quicksilver_n whereupon_o the_o aerial_a particle_n in_o the_o water_n become_v less_o compress_v than_o before_o not_o to_o mention_v that_o the_o bubble_n such_o as_o it_o be_v appear_v very_o much_o great_a than_o it_o will_v have_v do_v if_o the_o pressure_n of_o the_o atmosphere_n have_v not_o be_v keep_v from_o it_o by_o the_o weight_n of_o the_o subjacent_a pillar_n of_o mercury_n experiment_n xxvii_o about_o the_o ascension_n of_o liquor_n in_o very_o slender_a pipe_n in_o a_o exhaust_v receiver_n what_o i_o relate_v to_o your_o lordship_n in_o the_o 35_o the_o of_o the_o publish_v experiment_n pag._n 138._o about_o the_o seem_o spontaneous_a ascension_n of_o water_n in_o slender_a pipe_n have_v occasion_v the_o make_n of_o many_o trial_n by_o the_o curious_a whereby_o that_o experiment_n have_v be_v not_o a_o little_a diversify_v but_o because_o among_o those_o i_o have_v yet_o hear_v of_o none_o have_v be_v make_v in_o our_o engine_n it_o may_v not_o be_v amiss_o to_o add_v the_o follow_a trial_n which_o may_v be_v of_o use_n in_o the_o examen_fw-la of_o one_o or_o two_o of_o the_o chief_a conjecture_n that_o have_v hitherto_o be_v propose_v about_o the_o cause_n of_o that_o odd_a phaenomenon_fw-mi we_o tinge_v some_o spirit_n of_o wine_n with_o cocheneel_v which_o be_v put_v into_o the_o receiver_n and_o the_o air_n withdraw_v do_v exceed_o bubble_v for_o a_o pretty_a while_n then_o little_a hollow_a pipe_n of_o differ_v size_n be_v put_v into_o it_o the_o red_a liquor_n ascend_v high_a in_o the_o slendere_a than_o the_o other_o but_o upon_o the_o withdraw_n of_o the_o air_n there_o scarce_o appear_v any_o sensible_a difference_n in_o the_o height_n of_o the_o liquor_n nor_o yet_o upon_o the_o let_v it_o in_o again_o afterward_o two_o such_o pipe_n of_o differ_v size_n be_v fasten_v together_o at_o a_o distance_n with_o cement_n be_v let_v down_o into_o the_o same_o spirit_n of_o wine_n when_o the_o receiver_n be_v well_o exhaust_v notwithstanding_o which_o the_o liquor_n ascend_v in_o they_o for_o aught_o we_o can_v plain_o see_v after_o the_o ordinary_a manner_n only_o when_o the_o air_n be_v let_v in_o again_o there_o seem_v to_o be_v some_o little_a and_o but_o very_o little_a rise_v at_o least_o in_o one_o of_o the_o pipe_n in_o this_o trial_n this_o phaenomenon_n be_v note_v that_o though_o there_o appear_v no_o bubble_n at_o all_o in_o the_o vesseled_a spirit_n of_o wine_n notwithstanding_o that_o we_o continue_v to_o pump_v 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