{"event":"ecommerce_event","event_name":"view_item","event_category":"browse_catalog","ecommerce":{"items":[{"item_id":"BAL116092","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"egyptian_second_intermediate_period_c_1750_c_1650_bc","item_category5":"not_balown","item_list_name":"search_results","item_name":"detail_of_the_rhind_mathematical_papyrus_hyksos_period_15th_dynasty_c_1550_bc_papyrus_see_also_9712","item_variant":"undefined"},{"item_id":"GIA4812783","item_category":"photo","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"la_pascaline_calculation_machine_of_blaise_pascal","item_variant":"undefined"},{"item_id":"MFR348317","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"adams_george_1750_95","item_category5":"not_balown","item_list_name":"search_results","item_name":"18_inch_hadley_quadrant_or_octant_c_1760_wood_brass_glass","item_variant":"undefined"},{"item_id":"LLE5234064","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"bogdanov_belsky_nikolai_petrovich_1868_1945","item_category5":"not_balown","item_list_name":"search_results","item_name":"mental_calculation_1895_colour_litho","item_variant":"undefined"},{"item_id":"BAL136314","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"plate_i_illustrating_law_ii_from_volume_i_of_the_mathematical_principles_of_natural_philosophy_by_si","item_variant":"undefined"},{"item_id":"MFR348329","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"adams_george_1750_95","item_category5":"not_balown","item_list_name":"search_results","item_name":"sextant_brass_wood_glass","item_variant":"undefined"},{"item_id":"CHT171359","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"calculating_machine_invented_by_blaise_pascal_1623_63_in_1642_wood_and_metal","item_variant":"undefined"},{"item_id":"XJF359054","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"dutch_school_17th_century","item_category5":"balown","item_list_name":"search_results","item_name":"johann_adam_schall_von_bell_from_china_illustrata_by_athanasius_kircher_1667_engraving","item_variant":"undefined"},{"item_id":"BAL136311","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"plate_xx_from_volume_i_of_the_mathematical_principles_of_natural_philosophy_by_sir_isaac_newton_1642","item_variant":"undefined"},{"item_id":"CHT162794","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"reisch_gregor_d_1525","item_category5":"not_balown","item_list_name":"search_results","item_name":"allegory_of_arithmetic_from_margarita_philosophica_by_gregor_reisch_1503_woodcut","item_variant":"undefined"},{"item_id":"NUM42003","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_12th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"diagrams_of_measurements_and_text_vellum","item_variant":"undefined"},{"item_id":"GIA4792133","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"unknown_artist_16th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"an_astronomer_doing_calculations_using_a_sextant_during_an_eclipse_engraving_of_the_16th_century","item_variant":"undefined"},{"item_id":"XZL151817","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"balown","item_list_name":"search_results","item_name":"astrolabe_for_calculating_horoscopes_european_brass","item_variant":"undefined"},{"item_id":"XAB364919","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"moravov_alexander_viktorovich_1878_1951","item_category5":"balown","item_list_name":"search_results","item_name":"working_days_calculation_1934_oil_on_canvas","item_variant":"undefined"},{"item_id":"MFR348325","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"modern_reproduction_of_a_mariner_s_astrolabe_brass","item_variant":"undefined"},{"item_id":"GIA4784909","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"daschitzsky_jiri_16th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_great_comet_of_1577_above_prague_engraving_by_jiri_daschitzsky_this_comet_c_1577_v1_is_the_first","item_variant":"undefined"},{"item_id":"CHT164098","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"unknown_artist","item_category5":"not_balown","item_list_name":"search_results","item_name":"ms_latin_11411_fol_99_pythagoras_sphere_vellum","item_variant":"undefined"},{"item_id":"MFR348349","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"hadley_s_quadrant_with_transversal_boxwood_scale_c_1750_brass_wood","item_variant":"undefined"},{"item_id":"MFR348348","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"bennett_john_fl_1760","item_category5":"not_balown","item_list_name":"search_results","item_name":"plain_theodolite_with_trade_card_on_inside_of_case_lid_c_1780_brass","item_variant":"undefined"},{"item_id":"MFR348344","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"ramsden_jesse_1735_1800","item_category5":"not_balown","item_list_name":"search_results","item_name":"double_framed_bridge_sextant_c_1780_brass_wood","item_variant":"undefined"},{"item_id":"MFR348337","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"lodestone_magnetite","item_variant":"undefined"},{"item_id":"MFR348307","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"lenoir_etienne_1744_1832","item_category5":"not_balown","item_list_name":"search_results","item_name":"portable_transit_instrument_c_1800_brass","item_variant":"undefined"},{"item_id":"HST3083730","item_category":"photo","item_category2":"in_copyright","item_category3":"standard","item_category4":"cumming_robert_h_b_1943","item_category5":"not_balown","item_list_name":"search_results","item_name":"67_body_arc_off_circle_center_1975_gelatin_silver_contact_print_with_drawing","item_variant":"undefined"},{"item_id":"CHT223767","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"reisch_gregor_d_1525","item_category5":"not_balown","item_list_name":"search_results","item_name":"allegory_of_astronomy_from_an_edition_of_margarita_philosophica_by_gregor_reisch_published_in_basel_","item_variant":"undefined"},{"item_id":"IL994193","item_category":"illustration","item_category2":"in_copyright","item_category3":"standard","item_category4":"burton_h_m_20th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"omar_khayyam_works_out_the_calendar_1074ad_litho","item_variant":"undefined"},{"item_id":"MFR348309","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"lenoir_etienne_1744_1832","item_category5":"not_balown","item_list_name":"search_results","item_name":"reflecting_circle_brass_glass","item_variant":"undefined"},{"item_id":"HUM351604","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"korean_school","item_category5":"not_balown","item_list_name":"search_results","item_name":"counting_sticks_joseon_dynasty_wood","item_variant":"undefined"},{"item_id":"MFR348315","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"nairne_blunt_fl_1770s","item_category5":"not_balown","item_list_name":"search_results","item_name":"sextant_c_1780_brass","item_variant":"undefined"},{"item_id":"MFR348305","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"backstaff_lignum_vitae_boxwood","item_variant":"undefined"},{"item_id":"LSE4085522","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_20th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"calculation_of_the_quantity_of_gold_contained_in_the_sea_1927","item_variant":"undefined"},{"item_id":"XJF359014","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"delaram_francis_c_1590_1627","item_category5":"balown","item_list_name":"search_results","item_name":"portrait_of_a_gentleman_believed_to_be_thomas_harriot_c_1620_engraving","item_variant":"undefined"},{"item_id":"XIR152004","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"bogdanov_ivan_1855_1932","item_category5":"balown","item_list_name":"search_results","item_name":"for_the_calculation_layoff_1890_oil_on_canvas","item_variant":"undefined"},{"item_id":"TRK7133638","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"trigonometric_calculation_illustrations_1779_engraving","item_variant":"undefined"},{"item_id":"SZT5183793","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"wilke_rudolf_1873_1908","item_category5":"not_balown","item_list_name":"search_results","item_name":"rudolf_wilke_berechnung_calculation_1900","item_variant":"undefined"},{"item_id":"GRP434399","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"wynne_henry_fl_1662_1709","item_category5":"not_balown","item_list_name":"search_results","item_name":"sundial_plate_c_1690_brass","item_variant":"undefined"},{"item_id":"FIA5382576","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"bogdanov_belsky_nikolai_petrovich_1868_1945","item_category5":"not_balown","item_list_name":"search_results","item_name":"mental_calculation_at_primary_school_1895_oil_on_canvas","item_variant":"undefined"},{"item_id":"BOO228315","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"russian_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"sun_dial_c_1720_wood_ivory","item_variant":"undefined"},{"item_id":"MFR348336","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"metz_fl_c_1700","item_category5":"not_balown","item_list_name":"search_results","item_name":"dutch_surveying_circle_or_holland_circle_c_1700_brass","item_variant":"undefined"},{"item_id":"MFR348335","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"wright_thomas_fl_c_1740","item_category5":"not_balown","item_list_name":"search_results","item_name":"surveyor_s_level_c_1740_brass","item_variant":"undefined"},{"item_id":"XJF193898","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_16th_century_after","item_category5":"balown","item_list_name":"search_results","item_name":"a_genethliac_or_astrological_horoscope_from_science_and_literature_in_the_middle_ages_written_and_en","item_variant":"undefined"},{"item_id":"MFR348306","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"backstaff_lignum_vitae_boxwood","item_variant":"undefined"},{"item_id":"ACD224657","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_19th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"report_of_the_sessions_at_the_academie_des_sciences_by_jean_joseph_le_verrier_1811_77_on_the_planet_","item_variant":"undefined"},{"item_id":"XJF294097","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"german_school_16th_century_after","item_category5":"balown","item_list_name":"search_results","item_name":"a_volvelle_possibly_showing_the_cycles_of_the_moon_after_an_illustration_from_astronomicon_caesareum","item_variant":"undefined"},{"item_id":"MFR348330","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"ramsden_jesse_1735_1800_fraser_william_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"bridge_type_sextants_c_1780_brass","item_variant":"undefined"},{"item_id":"MFR348332","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_20th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"modern_replica_of_a_cross_staff_by_harriet_wynter_ltd_ivory_wood","item_variant":"undefined"},{"item_id":"MFR348308","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"lodestone_in_fish_skin_leather_case_mixed_media","item_variant":"undefined"},{"item_id":"BAL136312","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"proposition_x_problem_v_from_volume_i_of_the_mathematical_principles_of_natural_philosophy_by_sir_is","item_variant":"undefined"},{"item_id":"XCC2972686","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"crespi_giuseppe_maria_lo_spagnuolo_1665_1747","item_category5":"balown","item_list_name":"search_results","item_name":"fragmentary_copy_1710_15_red_chalk_on_ivory_laid_paper","item_variant":"undefined"},{"item_id":"LLM2811406","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_19th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"jedediah_buxton_aetat_49_engraving","item_variant":"undefined"},{"item_id":"MFR348323","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"hajji_ali_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"planispheric_astrolabe_copper_or_brass","item_variant":"undefined"},{"item_id":"EPL6905552","item_category":"photo","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"flammarion_photo","item_variant":"undefined"},{"item_id":"FGL5457036","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"astrologer_nostradamus_1503_1566","item_variant":"undefined"},{"item_id":"UIG5307700","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"a_merchant_and_his_clerk_using_a_calculating_table","item_variant":"undefined"},{"item_id":"MFR348318","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"goater_fl_c_1770","item_category5":"not_balown","item_list_name":"search_results","item_name":"hadley_quadrant_left_c_1770_and_backstaff_right_c_1760_brass_wood_ivory","item_variant":"undefined"},{"item_id":"UIG5307494","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"a_merchant_and_his_clerk_using_a_calculating_table","item_variant":"undefined"},{"item_id":"JLJ4686828","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"tour_georges_de_la_1593_1652","item_category5":"not_balown","item_list_name":"search_results","item_name":"money_pays_also_means_settling_accounts_17th_century_oil_on_canvas","item_variant":"undefined"},{"item_id":"MFR348312","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"sneewins_anthony_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"two_parts_of_a_compedium_dial_c_1650_brass_glass","item_variant":"undefined"},{"item_id":"MFR348301","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"hadley_quadrant_with_transversal_scale_mahogany_brass_ivory","item_variant":"undefined"},{"item_id":"SZT3515470","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category4":"alfred_strobel","item_category5":"not_balown","item_list_name":"search_results","item_name":"high_school_1960_b_w_photo","item_variant":"undefined"},{"item_id":"ELS9143270","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"lessing_erich","item_category5":"not_balown","item_list_name":"search_results","item_name":"calculation_of_the_surface_area_of_a_terrain_at_umma_mesopotamia","item_variant":"undefined"},{"item_id":"PRX11865721","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"pass_john_c_1783_1832","item_category5":"not_balown","item_list_name":"search_results","item_name":"logarithmic_calculation_devices_and_nautical_instruments_1810_print","item_variant":"undefined"},{"item_id":"XEE4139780","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"anonymous","item_category5":"balown","item_list_name":"search_results","item_name":"work_and_power_calculation_of_kinetic_energy_1925_print","item_variant":"undefined"},{"item_id":"PCT8975988","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"patrice_cartier","item_category5":"not_balown","item_list_name":"search_results","item_name":"schoolboy_doing_a_chalk_calculation_on_a_blackboard_1907_drawing","item_variant":"undefined"},{"item_id":"MFR348310","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"aboab_mordecai_semah_c_1707_55","item_category5":"not_balown","item_list_name":"search_results","item_name":"inclining_analemmatic_sundial_c_1750_brass","item_variant":"undefined"},{"item_id":"MFR348327","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"dutch_school_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"graphometer_or_clinometer_brass_glass_steel","item_variant":"undefined"},{"item_id":"MFR348316","item_category":"object","item_category2":"in_copyright","item_category3":"standard","item_category4":"wright_thomas_fl_c_1740","item_category5":"not_balown","item_list_name":"search_results","item_name":"circumferentor_in_oak_case_c_1740_mixed_media","item_variant":"undefined"},{"item_id":"MFR348334","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"dollond_19th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"marine_barometer_with_wall_support_and_gimbals_in_wooden_case_with_instructions_c_1820_mahogany_bras","item_variant":"undefined"},{"item_id":"FGL5486892","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"navigational_instruments_an_astronomer_or_navigator_using_a_crossbow_or_crossbow_or_jacob_s_stick_to","item_variant":"undefined"},{"item_id":"UIG5426067","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"engraving_from_a_13th_century_manuscript_depicting_an_astronomy_lesson_the_central_figure_is_shown_u","item_variant":"undefined"},{"item_id":"CHT166621","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"calculating_machine_invented_by_blaise_pascal_1623_62_in_1642_wood_metal","item_variant":"undefined"},{"item_id":"DMA1072058","item_category":"illustration","item_category2":"in_copyright","item_category3":"standard","item_category4":"hughes_malcolm_1920_97","item_category5":"not_balown","item_list_name":"search_results","item_name":"a1_1984_pencil_on_graph_paper","item_variant":"undefined"},{"item_id":"DMA1072059","item_category":"illustration","item_category2":"in_copyright","item_category3":"standard","item_category4":"hughes_malcolm_1920_97","item_category5":"not_balown","item_list_name":"search_results","item_name":"a2_1984_pencil_on_graph_paper","item_variant":"undefined"},{"item_id":"XEE4149581","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_19th_century","item_category5":"balown","item_list_name":"search_results","item_name":"consumption_meter_for_the_use_of_lemonadiers_1862_engraving_in_le_monde_illustre_n_255_of_1_march_18","item_variant":"undefined"},{"item_id":"TRK560875","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"james_cook_1728_1779_calculation_the_astronomical_unit_in_tahiti","item_variant":"undefined"},{"item_id":"LLM3627176","item_category":"photo","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_photographer_20th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"division_photo","item_variant":"undefined"},{"item_id":"EPL7009400","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"galileo_galilei_italian_astronomer","item_variant":"undefined"},{"item_id":"MFR348311","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_school","item_category5":"not_balown","item_list_name":"search_results","item_name":"modern_replica_of_napier_s_bones_boxwood_walnut","item_variant":"undefined"},{"item_id":"CHT166620","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"french_school_17th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"calculating_machine_invented_by_blaise_pascal_1623_62_in_1642_wood_metal","item_variant":"undefined"},{"item_id":"LLM5215462","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"american_photographer_19th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"fish_and_vegetable_carts_a_close_calculation_b_w_photo","item_variant":"undefined"},{"item_id":"TBM375963","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"chosui_yabu_fl_c_1860_1930","item_category5":"not_balown","item_list_name":"search_results","item_name":"compass_and_branch_of_flowering_cherry_c_1930_woodblock_print","item_variant":"undefined"},{"item_id":"XEE4139753","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"anonymous","item_category5":"balown","item_list_name":"search_results","item_name":"gravitation_calculation_of_the_fall_of_the_moon_anonymous_illustration_of_1925_print","item_variant":"undefined"},{"item_id":"LLM5227049","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"english_photographer_19th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"mr_sol_stone_the_lightning_calculator_b_w_photo","item_variant":"undefined"},{"item_id":"EPL6827427","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"george_costard","item_variant":"undefined"},{"item_id":"UIG5310951","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"an_engraving_depicting_a_burroughs_adding_machine_which_printed_on_a_roll_20th_century","item_variant":"undefined"},{"item_id":"UIS3527176","item_category":"photo","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"scheutz_edvard_1821_81_scheutz_per_georg_1785_1873","item_category5":"not_balown","item_list_name":"search_results","item_name":"detail_of_the_scheutz_difference_engine_no_3_1859_metal","item_variant":"undefined"},{"item_id":"LLM5198945","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"wyatt_henry_1794_1840_after","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_astronomer_from_the_picture_in_the_vernon_gallery_engraving","item_variant":"undefined"},{"item_id":"AVE6322210","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"usa_1950s_calculation_of_basal_metabolism_using_a_formula_on_a_chart","item_variant":"undefined"},{"item_id":"UIG5311630","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"an_engraving_depicting_a_clerk_using_a_pascal_adding_machine_and_writing_down_his_results_with_a_qui","item_variant":"undefined"},{"item_id":"TRK879441","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"circumference_of_the_earth_leonardo_da_vinci_1452_1519_developed_a_novel_way_to_measure_the_area_of_","item_variant":"undefined"},{"item_id":"XKH158731","item_category":"illustration","item_category2":"in_copyright","item_category3":"standard","item_category4":"darboven_hanne_1941_2009","item_category5":"balown","item_list_name":"search_results","item_name":"untitled_work_from_kleine_konstruktion_new_york_1966_68_pen_ink_on_paper","item_variant":"undefined"}]}}

{"event":"custom_event","event_name":"view_search_result","event_category":"browse_catalog","keyword":"calculation","search_type":"standard","search_bridgeman_artists":"false","search_mode":"automatic","search_zero_result":"false","search_results":451,"search_results_page_number":1}