Selected quad for the lemma: book_n

Word A	Word B	Word C	Word D	Occurrence	Frequency Band	MI	MI Band	Prominent
book_n	author_n	word_n	write_v	2,404	5	5.2650	4	true

Text snippets containing the quad

ID	Title	Author	Corrected Date of Publication (TCP Date of Publication)	STC	Words	Pages
A51133	Dioptrica nova, A treatise of dioptricks in two parts : wherein the various effects and appearances of spherick glasses, both convex and concave, single and combined, in telescopes and microscopes, together with their usefulness in many concerns of humane life, are explained / by William Molyneux of Dublin, Esq. ...	Molyneux, William, 1656-1698.; Halley, Edmond, 1656-1742.	1692 (1692)	Wing M2405; ESTC R3440	201,330	332

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great_a partiality_n in_o a_o english_a author_n to_o his_o countryman_n especial_o consider_v how_o universal_o the_o contrary_n have_v prevail`d_v the_o vote_n of_o most_o learned_a man_n have_v confer_v the_o honour_n of_o this_o invention_n on_o other_o pretender_n but_o if_o from_o the_o unconstrained_a word_n of_o his_o book_n we_o plain_o make_v out_o this_o assertion_n i_o hope_v the_o attempt_n may_v not_o be_v count_v unreasonable_a or_o partial_a and_o first_o in_o his_o book_n of_o perspective_n part_v iii_o dis._n 2._o c._n 3._o he_o have_v these_o word_n si_fw-la vero_fw-la corpora_fw-la non_fw-la sunt_fw-la plana_fw-la have_v treat_v of_o they_o before_o per_fw-la quae_fw-la visus_fw-la videt_fw-la sed_fw-la sphaerica_fw-la tunc_fw-la est_fw-la magna_fw-la diversitas_fw-la nam_fw-la vel_fw-la concavitas_fw-la corporis_fw-la est_fw-la versus_fw-la oculum_fw-la vel_fw-la convexitas_fw-la etc._n etc._n by_o which_o it_o be_v manifest_a he_o know_v what_o a_o concave_a and_o 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in_o the_o transparent_a body_n the_o ray_n pass_v free_o this_o will_v be_v take_v by_o several_a as_o deep_o reason_v and_o yet_o be_v real_o no_o more_o than_o tautology_n as_o if_o we_o shall_v say_v the_o sun_n cast_v a_o shadow_n because_o he_o cast_v a_o shadow_n but_o it_o give_v no_o account_n of_o the_o opacity_n of_o one_o body_n and_o transparency_n of_o another_o which_o true_o the_o question_n require_v if_o we_o ask_v how_o fire_n burn_v it_o be_v answer_v by_o exciting_a a_o violent_a motion_n in_o the_o part_n of_o the_o combustible_a matter_n which_o indeed_o be_v no_o more_o than_o the_o same_o thing_n in_o different_a word_n but_o how_o motion_n be_v excite_v or_o communicate_v by_o one_o body_n to_o another_o be_v absolute_o inexplicable_a yet_o these_o kind_a of_o verbal_a reason_n do_v general_o pass_v in_o talk_n and_o serve_v to_o amuse_v as_o well_o as_o the_o best_a since_o therefore_o we_o can_v expect_v to_o arrive_v at_o the_o intimate_a knowledge_n of_o 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i_o be_v aware_a i_o must_v recover_v myself_o and_o beg_v pardon_n both_o for_o this_o digression_n and_o for_o tell_v you_o thing_n which_o you_o very_o well_o know_v already_o at_o the_o same_o time_n when_o i_o offer_v you_o a_o petition_n but_o my_o desire_n of_o propagate_a this_o useful_a method_n of_o philosophy_n will_v excuse_v my_o fault_n and_o at_o the_o same_o time_n will_v recommend_v i_o the_o more_o to_o your_o favour_n who_o be_v the_o great_a patron_n thereof_o and_o in_o account_n whereof_o your_o name_n be_v deserve_o celebrate_v all_o over_o europe_n permit_v i_o therefore_o to_o lay_v this_o offer_n at_o your_o foot_n it_o be_v the_o explication_n of_o one_o of_o the_o most_o noble_a instrument_n of_o experimental_a philosophy_n not_o that_o i_o think_v thereby_o to_o add_v any_o think_v considerable_a to_o the_o vast_a treasure_n of_o curiosity_n you_o already_o possess_v but_o that_o i_o may_v have_v a_o opportunity_n of_o declare_v to_o the_o world_n how_o much_o i_o be_o your_o devote_a humble_a servant_n william_n molyn●ux_n april_n 17._o 1690._o admonition_n to_o the_o reader_n before_o the_o reader_n proceed_v to_o the_o follow_a sheet_n i_o desire_v he_o may_v take_v notice_n first_o that_o he_o be_v not_o to_o expect_v geometrical_a strictness_n in_o several_a particular_n of_o this_o doctrine_n i_o say_v in_o several_a particular_n for_o many_o there_o be_v which_o will_v bear_v the_o most_o precise_a exactness_n kepler_n cavallerius_n herigon_n dechales_n honoratus_n faber_n gregorius_n barrow_n and_o other_o author_n have_v take_v this_o liberty_n as_o be_v more_o desirous_a of_o show_v in_o gross_a the_o property_n of_o glass_n and_o their_o effect_n in_o telescope_n than_o of_o affect_v a_o nicety_n which_o will_v be_v of_o little_a use_n in_o practice_n thus_o we_o shall_v find_v in_o what_o follow_v that_o many_o line_n be_v suppose_v equal_a which_o strict_o take_v be_v real_o not_o so_o but_o yet_o be_v so_o very_o little_a different_a that_o for_o all_o use_n and_o ease_v of_o demonstration_n they_o may_v be_v take_v as_o equal_v thus_o also_o we_o suppose_v very_o small_a angle_n and_o their_o sin_n to_o be_v proportional_a which_o precise_o be_v not_o so_o but_o be_v so_o to_o the_o small_a and_o most_o insensible_a difference_n thus_o likewise_o we_o sometime_o consider_v not_o the_o glass_n thickness_n but_o suppose_v it_o of_o the_o least_o thickness_n imaginable_a or_o of_o no_o thickness_n at_o all_o which_o yet_o be_v false_a but_o do_v hardly_o prejudice_v any_o demonstration_n for_o dioptric_n be_v a_o part_n of_o mix_a mathematics_n conversant_a about_o material_a line_n or_o ray_n of_o light_n and_o the_o refractive_a power_n of_o a_o corporeal_a glass_n can_v be_v deliver_v with_o that_o 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d geometrica_fw-la requisite_a in_o abstract_a mathematics_n second_o the_o reader_n will_v find_v some_o corollary_n and_o scholiums_n hereafter_o deliver_v which_o of_o 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in_o this_o part_n of_o mathematics_n ever_o yet_o publish_v in_o english_a and_o i_o be_o sure_a there_o be_v many_o ingenious_a head_n great_a geometer_n and_o master_n in_o mathematics_n who_o be_v not_o so_o well_o skilled_a in_o latin_n if_o foreigner_n may_v think_v this_o work_n deserve_v their_o perusal_n in_o time_n perhaps_o i_o may_v satisfy_v they_o and_o because_o i_o have_v study_v to_o be_v as_o plain_a as_o possible_o i_o can_v i_o have_v choose_v rather_o to_o be_v prolix_a in_o many_o particular_n than_o leave_v any_o ambiguity_n to_o the_o most_o ordinary_a mathematician_n and_o therefore_o in_o demonstrate_v i_o often_o repeat_v several_a step_n though_o the_o least_o alter_v that_o all_o thing_n may_v lie_v as_o plain_a as_o possible_a and_o on_o this_o account_n i_o hope_v the_o curious_a and_o profound_a geometer_n will_v pardon_v i_o i_o know_v they_o be_v use_v to_o what_o be_v concise_a and_o close_o put_v together_o much_o express_v in_o a_o little_a but_o this_o method_n suit_v not_o every_o reader_n and_o i_o have_v choose_v to_o accommodate_v i_o to_o the_o plain_a capacity_n last_o in_o this_o practical_a kind_n of_o mathematics_n i_o desire_v the_o reader_n to_o have_v frequent_a recourse_n to_o experiment_n for_o these_o illustrate_v the_o theory_n and_o make_v many_o thing_n clear_a which_o otherwise_o will_v pass_v obscure_o i_o use_v the_o common_a note_n of_o algebra_n with_o two_o or_o three_o new_a one_o introduce_v by_o branker_n or_o dr._n pell_n such_o as_o ÷_o signify_v divide_v by_o ÷_o 2_o signify_v divide_v by_o 2._o 2_o with_o a_o line_n over_o it_o signify_v the_o absolute_a number_n 2._o *_o be_v the_o note_n of_o multiplication_n or_o draw_v into_o in_o the_o demonstration_n the_o large_a and_o lesser_a margin_n or_o column_n be_v of_o the_o same_o use_n as_o be_v express_v in_o dr._n pell_n algebra_n to_o which_o i_o refer_v the_o reader_n april_n 17._o

we_o must_v consider_v that_o these_o labour_v under_o the_o contrary_a defect_n with_o old_a man_n for_o they_o see_v nigh_o object_n distinct_o but_o distant_a object_n confuse_o must_v be_v relieve_v with_o a_o remedy_n of_o a_o contrary_a effect_n and_o therefore_o they_o be_v help_v by_o concave-glass_n which_o bring_v the_o ray_n of_o distant_a object_n into_o the_o eye_n as_o if_o they_o be_v nigh_o and_o because_o we_o may_v conceive_v the_o crystallines_n of_o these_o eye_n as_o too_o protuberant_a or_o convex_a therefore_o we_o be_v to_o take_v off_o from_o this_o too_o great_a convexity_n by_o add_v a_o adventitious_a concavity_n but_o then_o there_o be_v nothing_o so_o universal_o complain_v of_o by_o those_o who_o be_v thus_o affect_v as_o the_o difficulty_n they_o find_v in_o fit_v proper_a glass_n to_o their_o eye_n for_o the_o removal_n whereof_o the_o follow_a rule_n may_v be_v observe_v first_o that_o for_o view_v distant_a object_n according_a to_o what_o be_v note_v 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so_o useful_a at_o a_o object_n distant_a a_o hundred_o or_o fifty_o foot_n all_o which_o be_v manifest_a from_o the_o doctrine_n in_o the_o first_o part._n four_o there_o be_v some_o eye_n so_o ill_o conform_v that_o no_o glass_n whatever_o will_v relieve_v they_o of_o this_o i_o have_v often_o hear_v a_o very_a ingenious_a man_n and_o great_a philosopher_n sir_n william_n petty_a often_o complain_v in_o his_o own_o particular_a but_o then_o this_o proceed_v not_o from_o a_o too_o little_a or_o too_o great_a a_o convexity_n in_o the_o crystalline_a but_o from_o some_o other_o indisposition_n or_o ill_a configuration_n not_o to_o be_v relieve_v by_o glass_n last_o person_n purblind_a labour_n under_o this_o great_a inconvenience_n that_o the_o glass_n which_o relieve_v they_o in_o one_o particular_a do_v hinder_v their_o strong_a vision_n of_o distant_a object_n in_o another_o particular_a for_o as_o concave-glass_n do_v order_v the_o ray_n from_o any_o one_o single_a point_n proper_o to_o be_v receive_v by_o the_o eye_n of_o a_o myops_n so_o at_o the_o same_o time_n they_o diminish_v the_o appearance_n of_o the_o whole_a object_n and_o from_o hence_o it_o be_v that_o though_o these_o sort_n of_o eye_n may_v be_v well_o enough_o relieve_v for_o read_v and_o write_v at_o a_o convenient_a distance_n and_o for_o see_v pretty_a large_a object_n at_o the_o distance_n of_o 100_o 200_o or_o 500_o foot_n yet_o for_o object_n much_o far_o unless_o they_o be_v very_o large_a indeed_o they_o be_v not_o so_o easy_o supply_v 3._o and_o here_o i_o can_v but_o take_v notice_n of_o a_o ingenious_a intimation_n of_o mr._n hook_n consider_v to_o who_o the_o world_n be_v certain_o much_o oblige_v for_o his_o curious_a contrivance_n in_o mechanic_n and_o his_o other_o philosophic_a endeavour_n publish_v in_o num._n 3._o of_o the_o philosophical_a collection_n lond._n 1681._o which_o he_o call_v myopibus_fw-la juvamen_fw-la it_o be_v brief_o this_o that_o some_o sort_n of_o shortsighted_a person_n who_o can_v be_v relieve_v by_o concave_a glass_n may_v perhaps_o find_v some_o help_n in_o convex-glass_n their_o eye_n be_v remove_v at_o a_o convenient_a distance_n far_o from_o these_o glass_n than_o their_o distinct_a base_n as_o for_o read_v by_o these_o glass_n the_o book_n must_v be_v invert_v and_o then_o the_o image_n in_o the_o distinct_a base_a shall_v be_v erect_v and_o the_o eye_n shall_v perceive_v it_o erect_v as_o for_o write_v the_o difficulty_n be_v great_a than_o mention_v by_o the_o learned_a author_n for_o the_o myops_n must_v not_o only_o learn_v to_o write_v invert_v but_o also_o retrograde_a viz._n from_o the_o right_n to_o the_o left_a hand_n and_o what_o be_v yet_o more_o inconvenient_a from_o the_o bottom_n towards_o the_o top_n of_o the_o page_n which_o be_v hardly_o practicable_a on_o account_n of_o blot_v the_o wet_a write_n as_o for_o view_v distant_a object_n with_o these_o glass_n i_o acknowledge_v with_o the_o ingenious_a author_n that_o much_o of_o the_o disagreableness_n of_o the_o invert_v prospect_n be_v take_v off_o by_o use_n and_o custom_n as_o i_o myself_o have_v experience_v by_o my_o frequent_a use_n of_o invert_v telescope_n but_o yet_o i_o can_v go_v so_o far_o with_o the_o author_n as_o to_o assent_v to_o his_o deduction_n from_o hence_o which_o be_v that_o it_o be_v only_a use_n and_o custom_n that_o make_v we_o judge_v object_n erect_v that_o be_v perceive_v by_o a_o invert_v image_n on_o the_o fund_z of_o the_o eye_n for_o then_o a_o man_n stand_v on_o his_o head_n shall_v judge_v the_o tree_n and_o other_o object_n he_o see_v invert_v which_o no_o one_o in_o his_o sense_n will_v do_v but_o rather_o judge_v what_o be_v right_a viz._n that_o he_o himself_o be_v invert_v whilst_o the_o circumjacent_a object_n continue_v erect_v this_o will_v be_v more_o evident_a to_o we_o by_o consider_v the_o case_n of_o a_o adult_n person_n who_o have_v be_v blind_a from_o his_o birth_n and_o now_o sudden_o restore_v to_o his_o sight_n he_o be_v not_o prejudice_v by_o custom_n and_o yet_o doubtless_o will_v judge_v as_o be_v usual_a but_o last_o a_o other_o great_a difficulty_n that_o will_v attend_v the_o use_n of_o these_o spectacle_n for_o myopes_n be_v that_o they_o must_v be_v carry_v at_o such_o a_o distance_n from_o the_o eye_n that_o it_o will_v be_v very_o troublesome_a to_o manage_v they_o commodious_o and_o if_o to_o this_o again_o we_o add_v the_o distance_n requisite_a for_o the_o object_n i_o question_v whether_o some_o man_n arm_n will_v be_v long_o enough_o to_o manage_v a_o pen_n for_o write_v or_o turn_v the_o leave_v of_o a_o book_n i_o have_v be_v the_o long_o on_o this_o proposal_n because_o the_o worthy_a author_n do_v candid_o invite_v all_o to_o communicate_v to_o the_o public_a what_o real_a benefit_n by_o it_o or_o objection_n against_o it_o they_o shall_v find_v 4._o i_o shall_v conclude_v this_o chapter_n with_o the_o way_n of_o adapt_a telescope_n and_o microscope_n to_o defective_a eye_n eye_n which_o be_v briesly_a thus_o a_o telescope_n compose_v of_o a_o convex_a object-glass_n and_o concave_a eye-glass_n be_v apply_v to_o a_o old_a eye_n the_o eye-glass_n may_v be_v a_o little_a far_o remove_v from_o the_o object-glass_n than_o ordinary_o on_o the_o contrary_a in_o such_o a_o telescope_n for_o the_o eye_n of_o a_o myops_n the_o eye-glass_n may_v be_v remove_v a_o little_a nigh_o to_o the_o object-glass_n the_o reason_n hereof_o be_v manifest_a from_o what_o have_v be_v deliver_v in_o the_o first_o part._n but_o then_o how_o much_o far_o or_o nigh_o they_o be_v to_o be_v remove_v be_v only_o to_o be_v determine_v by_o experiment_n and_o by_o every_o one_o fit_v the_o glass_n to_o his_o own_o eye_n and_o so_o likewise_o in_o telescope_n compose_v of_o a_o convex_a object-glass_n and_o convex_a eye-glass_n for_o

a_o revolution_n give_v 34_o +_o and_o thus_o the_o table_n be_v compose_v to_o any_o number_n of_o part_n and_o revolution_n requisite_a but_o this_o way_n depend_v on_o the_o exact_a admeasurement_n of_o the_o distance_n of_o the_o micrometer_n edge_n which_o can_v hardly_o be_v obtain_v to_o sufficient_a accuracy_n unless_o we_o know_v most_o nice_o what_o number_n of_o thread_n in_o the_o screw_v there_o be_v in_o a_o inch_n length_n for_o than_o we_o know_v what_o number_n of_o revolution_n complete_a a_o inch_n it_o be_v not_o so_o accurate_a as_o what_o follow_v which_o be_v the_o second_o way_n for_o compose_v the_o table_n be_v this_o have_v fix_v the_o micrometre_n at_o its_o due_a distance_n from_o the_o object-glass_n on_o the_o side_n of_o a_o wall_n or_o house_n far_o distant_a mark_n out_o two_o conspicuous_a object_n that_o may_v both_o at_o a_o time_n be_v receive_v into_o the_o telescope_n measure_v nice_o the_o distance_n of_o these_o object_n from_o each_o other_o and_o also_o the_o distance_n of_o either_o of_o they_o from_o the_o object-glass_n which_o we_o suppose_v direct_o before_o the_o point_n in_o the_o wall_n middle_a between_o the_o two_o object_n and_o by_o trigonometry_n calculate_v the_o angle_n which_o the_o distance_n between_o these_o two_o object_n subtend_v before_o the_o object-glass_n then_o look_v through_o the_o telescope_n open_v the_o micrometre_n till_o the_o two_o edge_n thereof_o exact_o meet_v with_o or_o embrace_v these_o two_o object_n and_o observe_v how_o many_o revolution_n and_o part_n of_o a_o revolution_n be_v perform_v in_o this_o open_n for_o so_o many_o complete_a the_o angle_n before_o calculate_v and_o have_v the_o revolution_n and_o part_n that_o complete_a any_o one_o angle_n we_o may_v easy_o find_v all_o the_o rest_n as_o aforesaid_a for_o in_o these_o small_a angle_n the_o angle_n and_o revolution_n be_v proportional_a that_o be_v if_o a_o certain_a number_n of_o revolution_n give_v a_o certain_a angle_n half_o this_o number_n give_v half_o this_o angle_n and_o the_o hundred_o part_n of_o this_o number_n give_v the_o hundred_o part_n of_o the_o angle_n etc._n etc._n in_o the_o first_o method_n that_o i_o propose_v for_o adapt_a the_o micrometre_n and_o compose_v the_o table_n i_o have_v allow_v for_o the_o object-glass_n thickness_n in_o measure_v its_o distance_n from_o the_o micrometre_n but_o this_o nicety_n be_v hardly_o requisite_a unless_o it_o be_v in_o short_a tubes_fw-la for_o at_o the_o radius_fw-la of_o 10_o foot_n 1_o inch_n be_v the_o tangent_fw-la of_o 28_o '_o 38_o and_o at_o the_o radius_fw-la of_o 10_o foot_n +_o one_o ten_o of_o a_o inch_n 1_o inch_n be_v the_o tangent_fw-la of_o 28_o '_o 37_o so_o there_o be_v but_o one_o second_o difference_n though_o we_o shall_v err_v one_o ten_o of_o a_o inch_n in_o admeasure_v the_o distance_n between_o the_o object_n glass_n and_o micrometre_n i_o may_v now_o mention_v the_o application_n of_o a_o lattice_n of_o fine_a hair_n in_o the_o focus_n of_o the_o object-glass_n of_o a_o telescope_n telescopick-instrument_n as_o a_o help_n to_o draw_v distant_a object_n in_o perspective_n and_o of_o apply_v there_o a_o pretty_a contrive_a parallelogram_n for_o the_o same_o purpose_n but_o the_o first_o be_v obvious_a enough_o by_o the_o least_o intimation_n thereof_o and_o the_o latter_a be_v so_o ample_o describe_v by_o pere_n cherubin_n d'orlean_v in_o his_o dioptrique_fw-la oculaire_n that_o it_o be_v needless_a to_o add_v any_o thing_n far_o in_o this_o place_n i_o conclude_v this_o chapter_n with_o a_o brief_a hint_n of_o what_o i_o have_v find_v very_o commodious_a for_o many_o purpose_n cross-hair_n that_o be_v instead_o of_o the_o forementioned_a cross-hair_n i_o have_v often_o use_v a_o curious_a piece_n of_o clear_a thin_a flat_a glass_n whereon_o there_o be_v draw_v two_o very_o fine_a cross-line_n by_o the_o curious_a point_n of_o a_o diamond_n small_a than_o the_o most_o fine_a wyre_n or_o hair_n not_o easy_o disturb_v by_o a_o sleight_n touch_n unless_o we_o break_v the_o glass_n nor_o alterable_a by_o heat_n and_o cold._n thus_o also_o may_v we_o make_v a_o lattice_n chap._n vi_o of_o the_o invention_n discovery_n make_v by_o and_o other_o application_n of_o optick-glass_n 1._o optick-glass_n unknown_a to_o the_o ancient_n 2._o pretend_a passage_n in_o plautus_n 3._o an_o other_o passage_n in_o pliny_n 4._o probably_n invent_v about_o 1300._o 5._o friar_z bacon_n pretence_n 6._o inventor_n of_o the_o telescope_n 7._o optick-glass_n long_o know_v before_o the_o telescope_n remark_n thereon_o 8._o celestial_a discovery_n by_o the_o telescope_n 9_o in_o the_o fix_a star_n 10._o in_o saturn_n examination_n of_o gallet_n hypothesis_n 11._o in_o jupiter_n motion_n of_o his_o satellit_n diligent_o prosecute_v by_o cassini_n and_o flamsteed_n satellits_n all_o disappear_v 12._o reflection_n on_o the_o motion_n of_o saturn_n and_o jupiter_n satellit_n 13._o in_o mars_n 14._o in_o the_o sun_n 15._o in_o venus_n and_o mercury_n hence_o the_o falsity_n of_o the_o ptolemaick_a hypothesis_n 16._o in_o the_o moon_n 17._o planet_n whether_o inhabit_v 18._o telescope_n use_v on_o earth_n 19_o use_v of_o the_o celestial_a discovery_n of_o the_o telescope_n 20._o microscopick_a discovery_n and_o writer_n 21._o view_v nigh_o object_n with_o a_o telescope_n use_v thereof_o in_o maniature-painting_a 22._o measure_v distance_n at_o one_o station_n by_o the_o telescope_n 1._o that_o the_o ancient_n have_v no_o knowledge_n of_o optick-glass_n ancient_n be_v most_o evident_a from_o their_o universal_a silence_n in_o this_o matter_n their_o most_o learned_a and_o inquisitive_a philosopher_n make_v no_o mention_n or_o the_o least_o hint_n thereof_o in_o their_o write_n and_o doubtless_o a_o contrivance_n of_o that_o universal_a use_n beneficial_a to_o all_o old_a man_n both_o in_o read_v and_o write_v can_v never_o have_v be_v so_o conceal_v as_o that_o not_o the_o least_o footstep_n thereof_o shall_v remain_v to_o posterity_n the_o only_a relief_n they_o have_v for_o their_o decay_a sight_n be_v certain_a collyria_fw-la or_o eye-salve_n and_o when_o these_o fail_v they_o they_o be_v leave_v almost_o in_o the_o dark_a for_o minute_n and_o close_a object_n we_o hear_v indeed_o mighty_a story_n of_o archimedes_n burn_v the_o ship_n of_o marcellus_n at_o a_o great_a distance_n from_o the_o wall_n of_o syracuse_n but_o whether_o the_o matter_n of_o fact_n be_v true_a or_o false_a as_o i_o be_o very_o inclinable_a to_o believe_v it_o false_a yet_o there_o be_v no_o mention_n of_o his_o perform_v this_o admirable_a effect_n by_o optick-glass_n perhaps_o if_o there_o be_v any_o such_o thing_n do_v at_o all_o it_o be_v perform_v by_o concave_a speculum_n and_o no_o one_o deny_v the_o ancient_n the_o knowledge_n of_o catoptric_n for_o archimedes_n himself_o write_v a_o book_n as_o it_o be_v say_v de_fw-fr speculis_fw-la ustoriis_fw-la parabolicis_fw-la but_o it_o have_v never_o yet_o see_v the_o light_n and_o yet_o there_o be_v in_o the_o world_n a_o sort_n of_o man_n so_o devote_v to_o the_o past_a age_n that_o they_o will_v not_o allow_v any_o improvement_n of_o art_n in_o the_o modern_a generation_n unknown_a to_o the_o age_n some_o century_n before_o we_o of_o this_o class_n be_v he_o whoever_o he_o be_v that_o rather_o than_o the_o ancient_n shall_v be_v ignorant_a of_o optick-glass_n will_v forge_v a_o passage_n in_o plautus_n which_o real_o be_v not_o at_o all_o to_o be_v find_v in_o he_o for_o confirmation_n of_o his_o opinion_n 2._o pancirollus_n who_o sure_o be_v too_o candid_a a_o person_n to_o be_v the_o first_o author_n of_o this_o fiction_n in_o the_o second_o book_n de_fw-fr rebus_fw-la inventis_fw-la plautus_n tit._n 15._o quote_v this_o passage_n from_o plautus_n cedò_fw-la vitrum_fw-la necesse_fw-la est_fw-la conspicilio_fw-la uti_fw-la which_o say_v he_o can_v possible_o be_v mean_v of_o any_o other_o thing_n but_o of_o the_o glass_n which_o we_o call_v spectacle_n and_o his_o commentator_n salmuth_n take_v some_o pain_n to_o cite_v christianus_n becmannus_fw-la i_o suppose_v in_o his_o oratio_fw-la de_fw-la barbary_n &_o superstitione_n superiorum_fw-la temporum_fw-la for_o clear_v this_o passage_n of_o plautus_n but_o yet_o he_o be_v so_o hard_o press_v with_o it_o that_o by_o no_o art_n but_o by_o main_a strength_n he_o break_v through_o it_o and_o say_v that_o notwithstanding_o that_o passage_n yet_o certain_o optick-glass_n be_v a_o modern_a invention_n whereas_o have_v he_o be_v aware_a forge_v that_o that_o quotation_n from_o plautus_n be_v a_o mere_a fiction_n and_o that_o no_o such_o passage_n can_v be_v find_v in_o all_o his_o write_n he_o may_v easy_o have_v avoid_v its_o force_n without_o all_o that_o stir_v for_o so_o we_o shall_v find_v it_o answer_v in_o the_o lettere_fw-la memorabili_fw-la del_fw-it abbate_n michele_n giustiani_fw-la parte_fw-la terza_n let._n 16._o 3._o another_o place_n cite_v for_o the_o antiquity_n of_o optick-glass_n