Selected quad for the lemma: cause_n

Word A Word B Word C Word D Occurrence Frequency Band MI MI Band Prominent
cause_n find_v great_a reason_n 2,541 5 4.6084 4 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A67384 A discourse of gravity and gravitation, grounded on experimental observations, presented to the Royal Society, November 12. 1674 by John Wallis ... Wallis, John, 1616-1703.; Royal Society (Great Britain) 1675 (1675) Wing W574; ESTC R18644 25,475 42

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as_o water_n and_o from_o he_o the_o torricellian_a experiment_n take_v its_o name_n the_o experiment_n be_v thus_o administer_v in_o fig._n 36._o a_o glass-pipe_n close_v at_o the_o bottom_n be_v fill_v with_o quicksilver_n and_o then_o invert_v the_o orifice_n be_v stop_v with_o the_o finger_n or_o otherwise_o till_o it_o be_v immerse_v in_o a_o vessel_n of_o stagnant_a quicksilver_n and_o then_o open_v if_o the_o height_n of_o the_o pipe_n above_o the_o stagnant_a quicksilver_n be_v not_o more_o than_o 29_o inch_n or_o thereabouts_o it_o will_v remain_v full_a the_o cause_n hereof_o say_v they_o be_v ne_o detur_fw-la vacuum_n for_o if_o the_o quicksilver_n shall_v sink_v there_o be_v no_o way_n for_o the_o air_n to_o enter_v there_o will_v ensue_v a_o vacuum_n which_o nature_n abhor_v the_o cause_n say_v we_o be_v because_o the_o weight_n of_o the_o incumbent_a air_n on_o a_o which_o we_o have_v already_o prove_v to_o be_v heavy_a be_v equivalent_a to_o the_o weight_n of_o 29_o inch_n of_o quicksilver_n which_o therefore_o be_v defend_v by_o the_o close_a glass_n which_o we_o suppose_v otherwise_o to_o be_v hold_v firm_a from_o any_o other_o pressure_n than_o its_o own_o weight_n be_v by_o that_o counterpressure_n sustain_v but_o further_o if_o the_o height_n of_o the_o pipe_n above_o the_o stagnant_a quicksilver_n be_v more_o than_o about_o 29_o inch_n that_o in_o the_o pipe_n will_v sink_v to_o that_o height_n as_o at_o e_o leaving_z space_n above_o it_o in_o the_o glass_n void_a of_o quicksilver_n but_o whether_o fill_v by_o any_o other_o imperceptible_a fluid_n we_o dispute_v not_o the_o reason_n why_o it_o so_o sink_v our_o ancestor_n have_v not_o assign_v because_o they_o be_v not_o at_o all_o aware_a of_o this_o phaenomenon_n but_o thought_n that_o ne_fw-la detur_fw-la vacuum_fw-la it_o will_v remain_v full_a whatever_o the_o height_n of_o the_o tube_n be_v some_o modern_n with_o des_n cartes_n that_o they_o may_v avoid_v a_o vacuum_n do_v imagine_v that_o a_o materia_fw-la subtilis_fw-la of_o which_o no_o sense_n can_v make_v any_o dicovery_n pierce_v the_o pore_n of_o the_o glass_n supply_v that_o place_n but_o if_o it_o will_v so_o supply_v the_o place_n above_o e_o and_o give_v the_o quicksilver_n leave_v to_o sink_v so_o low_a why_o it_o may_v not_o as_o well_o comein_a to_o relieve_v the_o rest_n and_o so_o give_v it_o leave_v to_o sink_v to_o a_o i_o do_v not_o find_v other_o with_o linus_n imagine_v that_o the_o weight_n of_o 29_o inch_n of_o quicksilver_n do_v stretch_v some_o part_n of_o its_o upper_a surface_n into_o a_o subtle_a matter_n very_o thin_a yet_o so_o as_o to_o fill_v that_o seem_o void_a space_n but_o because_o a_o less_o weight_n will_v not_o serve_v so_o to_o stretch_v it_o it_o fall_v no_o low_o which_o stretch_v matter_n like_o a_o funiculus_fw-la hold_v up_o the_o rest_n ne_fw-la detur_fw-la vacuum_fw-la but_o why_o this_o weight_n shall_v stretch_v some_o very_a small_a part_n of_o it_o so_o 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the_o liquor_n be_v the_o great_a height_n must_v be_v allow_v and_o in_o such_o proportion_n great_a to_o make_v up_o a_o equivalent_a weight_n but_o the_o cause_n be_v say_v we_o and_o it_o seem_v the_o most_o simple_a and_o unforced_a account_n because_o the_o counterpressure_n of_o the_o air_n be_v equivalent_a to_o that_o of_o about_o 29_o inch_n so_o much_o it_o be_v able_a to_o sustain_v but_o no_o more_o and_o just_o so_o much_o weight_n it_o will_v sustain_v whatever_o the_o liquor_n be_v whether_o specifical_o light_a or_o heavy_a and_o whether_o of_o a_o more_o firm_a or_o a_o loser_n texture_n and_o therefore_o to_o such_o a_o height_n it_o sink_v but_o no_o low_o and_o have_v the_o ancient_n be_v aware_a of_o what_o we_o find_v that_o the_o air_n have_v a_o positive_a gravity_n and_o consequent_o though_o it_o be_v but_o small_a in_o proportion_n to_o that_o of_o other_o body_n yet_o a_o great_a height_n of_o air_n may_v countervail_v a_o lesser_a height_n of_o a_o heavy_a liquor_n like_a as_o we_o see_v that_o a_o great_a height_n of_o water_n will_v countervail_v a_o lesser_a height_n of_o quicksilver_n they_o will_v not_o i_o presume_v have_v trouble_v themselves_o with_o a_o fuga_fw-la vacui_fw-la but_o say_v roundly_o that_o the_o weight_n of_o the_o air_n at_o its_o full_a height_n be_v equivalent_a to_o that_o of_o water_n at_o the_o height_n of_o about_o 34_o foot_n and_o of_o quicksilver_n at_o about_o 29_o inch_n and_o proportionable_o of_o other_o fluid_n and_o consequent_o when_o in_o the_o pump_n or_o syringe_n d_o by_z the_o embolus_fw-la or_o sucker_n be_v defend_v from_o the_o air_n pressure_n but_o a_o expose_v to_o it_o in_o fig._n 34._o this_o pressure_n on_o a_o will_v raise_v over_o b_o so_o much_o weight_n of_o water_n quicksilver_n or_o other_o fluid_a as_o be_v equivalent_a to_o that_o pressure_n in_o the_o same_o manner_n as_o if_o a_o and_o e_z were_z equal_o expose_v to_o the_o air_n pressure_n a_o quantity_n of_o oil_n pour_v on_o a_o will_v have_v raise_v a_o weight_n of_o water_n or_o quicksilver_n equivalent_a thereunto_o the_o like_a account_n we_o give_v of_o the_o syphon_n the_o pressure_n on_o a_o in_o fig._n 35._o will_v raise_v the_o fluid_a to_o the_o height_n of_o b_o if_o not_o great_a than_o what_o be_v before_o describe_v and_o from_o thence_o to_o o_o it_o fall_v by_o its_o own_o weight_n yet_o so_o that_o if_o o_o be_v high_a than_o a_o the_o air_n pressure_n at_o o_o will_v thrust_v up_o o_o to_o b_o suppose_v the_o pipe_n not_o so_o big_a as_o that_o the_o air_n can_v convenient_o pass_v by_o the_o liquor_n into_o the_o pipe_n and_o it_o will_v fall_v down_o to_o a_o by_o its_o own_o weight_n for_o now_o boy_n will_v less_o gravitate_fw-la than_o basilius_n while_o yet_o the_o air_n pressure_n will_v be_v much_o the_o same_o on_o both_o there_o be_v yet_o a_o considerable_a objection_n to_o be_v remove_v viz._n that_o air_n in_o a_o close_a vessel_n though_o of_o no_o great_a height_n press_v on_o a_o the_o surface_n of_o the_o stagnant_a quicksilver_n fig._n 37._o will_v sustain_v as_o high_a a_o pillar_n thereof_o in_o a_o close_a tube_n suppose_v ae_n as_o if_o a_o be_v expose_v to_o the_o open_a air_n whereas_o yet_o the_o weight_n of_o ad_fw-la within_o the_o vessel_n defend_v by_o the_o vessel_n from_o the_o pressure_n of_o the_o incumbent_a air_n can_v be_v of_o equal_a weight_n as_o if_o it_o have_v the_o whole_a height_n of_o the_o atmosphere_n but_o the_o reason_n of_o this_o be_v from_o the_o air_n spring_n which_o be_v always_o equivalent_a to_o the_o pressure_n lie_v upon_o it_o and_o consequent_o the_o spring_n of_o the_o air_n in_o its_o ordinary_a constitution_n with_o we_o must_v be_v equivalent_a to_o the_o weight_n of_o the_o incumbent_n air._n for_o if_o it_o be_v less_o the_o air_n incumbent_n will_v yet_o press_v it_o close_o if_o it_o be_v more_o the_o spring_n will_v relax_v itself_o by_o thrust_v away_o what_o press_v it_o which_o be_v so_o the_o air_n include_v with_o such_o a_o spring_n must_v therefore_o press_v with_o as_o great_a a_o strength_n as_o be_v equivalent_a to_o such_o a_o weight_n like_o as_o in_o other_o spring_n if_o acb_n in_o fig._n 38._o be_v press_v by_o the_o weight_n d_o to_o such_o a_o tensure_n as_o to_o bear_v it_o and_o then_o this_o spring_n so_o remain_v the_o weight_n be_v take_v away_o and_o our_o hand_n put_v in_o the_o place_n of_o it_o it_o will_v press_v as_o hard_o against_o the_o hand_n as_o before_o it_o do_v to_o sustain_v the_o weight_n that_o be_v with_o a_o force_n equal_a to_o that_o of_o the_o weight_n it_o sustain_v and_o if_o thus_o bow_v it_o be_v put_v in_o a_o vessel_n in_o fig._n 39_o it_o will_v with_o just_a the_o same_o force_n press_v against_o the_o side_n of_o it_o and_o just_o so_o it_o be_v in_o the_o present_a case_n where_o the_o air_n so_o include_v do_v press_v by_o its_o spring_n just_a with_o the_o same_o force_v as_o be_v that_o of_o the_o incumbent_a air_n 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