{"event":"ecommerce_event","event_name":"view_item","event_category":"browse_catalog","ecommerce":{"items":[{"item_id":"RGS242231","item_category":"photo","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":"index_chart_to_the_great_trigonometrical_survey_of_india_completed_in_1882_published_1885_photo_zinc","item_variant":"undefined"},{"item_id":"PIX4643037","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"satellite_gps_triangulation_artist_s_view_of_the_triangulation_system_uses_to_calculate_the_position","item_variant":"undefined"},{"item_id":"UIG3524454","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"conceptual_diagram_of_satellite_triangulation","item_variant":"undefined"},{"item_id":"UIG539874","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"measuring_the_distance_of_an_inaccessible_object_by_triangulation_using_a_hinged_staff_from_robert_f","item_variant":"undefined"},{"item_id":"ELC851851","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"alberti_leon_battista_1404_72","item_category5":"not_balown","item_list_name":"search_results","item_name":"ludi_matematici_schemas_of_triangulation_and_drawings_schema_di_triangolazione_e_disegni_by_da_alber","item_variant":"undefined"},{"item_id":"MFR348347","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"persian_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"persian_astrolabe_brass","item_variant":"undefined"},{"item_id":"UIS5065397","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_three_foot_geodetic_theodolite_1792","item_variant":"undefined"},{"item_id":"DRC701085","item_category":"photo","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"chesterman_james_fl_c_1880","item_category5":"not_balown","item_list_name":"search_results","item_name":"gunter_s_chain_c_1880_iron_brass","item_variant":"undefined"},{"item_id":"KES6249270","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"switzerland_belts_1952_b_w_photo","item_variant":"undefined"},{"item_id":"MFR348345","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"indian_school_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"indian_astrolabe_brass","item_variant":"undefined"},{"item_id":"PFH1176036","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"spain_al_andalus_an_astrolabe_made_by_muhammad_al_naqqhash_of_zaragoza_1080_ce","item_variant":"undefined"},{"item_id":"BL3278263","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"an_index_chart","item_variant":"undefined"},{"item_id":"HST1075090","item_category":"illustration","item_category2":"in_copyright","item_category3":"standard","item_category4":"raimo_leopoldo_1912_2001","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulacao_1956_oil_on_canvas","item_variant":"undefined"},{"item_id":"UIS5101501","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"plan_and_section_of_surveying_instrument_1799","item_variant":"undefined"},{"item_id":"UIG541805","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"using_a_quadrant_with_a_plumb_bob_to_calculate_the_height_of_a_tower_by_triangulation_from_sebastian","item_variant":"undefined"},{"item_id":"LIP1053191","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":"the_coming_transit_of_venus_the_triangulation_of_the_island_of_rodriguez_engraving","item_variant":"undefined"},{"item_id":"UIG540878","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"using_a_quadrant_with_a_plumb_bob_to_calculate_the_height_of_a_tower_by_triangulation_from_sebastian","item_variant":"undefined"},{"item_id":"UIG541798","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_with_a_hinged_staff_from_sebastian_munster_rudimenta_mathematica_basle_1551_woodcut","item_variant":"undefined"},{"item_id":"UIS5088687","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_c_1606","item_variant":"undefined"},{"item_id":"LLM2781481","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":"hoisting_the_signals_for_triangulation_engraving","item_variant":"undefined"},{"item_id":"LLM6018907","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":"transverse_sections_of_old_buildings_shewing_mr_pullan_s_system_of_triangulation_engraving","item_variant":"undefined"},{"item_id":"UIG539882","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cross_staffs_used_for_surveying_in_this_case_for_measuring_the_width_of_a_river_by_triangulation_fro","item_variant":"undefined"},{"item_id":"DGA570981","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_of_perpendicular_to_meridian_of_observatory_eastern_part_pen_drawing_1734","item_variant":"undefined"},{"item_id":"UIS5079142","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"plan_of_the_principal_triangulation_of_britain_1787_1790","item_variant":"undefined"},{"item_id":"DEX5040795","item_category":"object","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"lanci_baldassare_baldassare_da_urbino_c_1510_71","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_instrument_in_gold_brassed_16th_century_brass","item_variant":"undefined"},{"item_id":"AGC477516","item_category":"illustration","item_category2":"in_copyright","item_category3":"premium","item_category4":"akhunov_masabikh_1928_2008","item_category5":"not_balown","item_list_name":"search_results","item_name":"land_surveying_1983_linocut","item_variant":"undefined"},{"item_id":"LZT5474548","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"1859_u_s_coast_survey_triangulation_map_of_the_florida_keys","item_variant":"undefined"},{"item_id":"EVB2931305","item_category":"photo","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"surveying_gemma_frisius_s_1533_diagram_demonstrating_the_new_concept_of_triangulation_1911_reproduct","item_variant":"undefined"},{"item_id":"LZT5476443","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"1865_u_s_coast_survey_triangulation_map_of_san_francisco_bay","item_variant":"undefined"},{"item_id":"DGA570988","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"reiner_gemma_frisius_libellus_de_locorum_describendorum_ratione_published_as_appendix_to_cosmographi","item_variant":"undefined"},{"item_id":"NAM237667","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"burrard_gertrude_ellen_fl_1890s","item_category5":"not_balown","item_list_name":"search_results","item_name":"maung_pe_a_chaprassee_in_the_triangulation_survey_party_1892_oil_on_canvas","item_variant":"undefined"},{"item_id":"DGA570837","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_of_the_perpendicular_to_the_meridian_of_the_observatory_by_don_jean_picard_pen_drawing","item_variant":"undefined"},{"item_id":"LZT5460468","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"1857_u_s_coast_survey_triangulation_map_of_matagorda_bay_to_galveston_bay_texas","item_variant":"undefined"},{"item_id":"DGA570860","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"triangulation_between_brussels_antwerp_ghent_and_middelburg_by_reiner_gemma_frisius_printed_in_antwe","item_variant":"undefined"},{"item_id":"UDK838642","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"great_britain_england_devon_dartmoor_national_park_triangulation_pillar_and_cairn_on_summit_of_hamel","item_variant":"undefined"},{"item_id":"BL3327282","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"boxstead_the_draughtsman_used_balsham_steeple_and_west_wickham_steeple_at_the_top_left_of_this_plan_","item_variant":"undefined"},{"item_id":"BL3260231","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"faversham_kent_18th_century_map_this_is_a_plan_of_the_kentish_flatlands_surrounding_faversham_to_the","item_variant":"undefined"},{"item_id":"BL3260230","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"stow_market_this_is_a_plan_of_the_gipping_valley_in_suffolk_the_circular_hole_in_the_top_left_hand_m","item_variant":"undefined"},{"item_id":"BL3288261","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"dartford_kent_details_of_this_drawing_are_corrected_in_heavy_black_ink_with_crosses_placed_over_inco","item_variant":"undefined"},{"item_id":"UIG3525147","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"light_keeper_s_camp_after_a_storm_south_central_alaska_1923","item_variant":"undefined"},{"item_id":"BL3296873","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"welford_this_drawing_depicts_the_boundary_of_leicestershire_and_northamptonshire_the_county_border_i","item_variant":"undefined"},{"item_id":"BL3288257","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"halstow_kent_drawing_showing_the_area_around_halstow_in_kent_this_map_is_drawn_on_rectangular_sheet_","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":"BL3298852","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"merston_kent_18th_century_map_this_map_is_drawn_on_rectangular_sheet_lines_enclosed_by_a_black_borde","item_variant":"undefined"},{"item_id":"BL3278369","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"hills_near_golconda_and_hyderabad","item_variant":"undefined"},{"item_id":"UIS5101493","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"general_view_of_the_instrument_1799","item_variant":"undefined"},{"item_id":"UIS5079146","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_first_great_theodolite_c_1790","item_variant":"undefined"},{"item_id":"UIS5101503","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"locations_used_for_surveying_1799","item_variant":"undefined"},{"item_id":"UIS5079197","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_first_ramsden_three_foot_theodolite_1790","item_variant":"undefined"},{"item_id":"UIS5101502","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"portable_transit_instrument_1799","item_variant":"undefined"},{"item_id":"UIS5079202","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_first_ramsden_three_foot_theodolite_1790","item_variant":"undefined"},{"item_id":"UIS5079134","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"line_engraving_of_the_first_great_theodelit_line_engraving_of_the_first_great_theodelite_3_ft_horizo","item_variant":"undefined"},{"item_id":"UIS5065376","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_three_foot_geodetic_theodolite_1792","item_variant":"undefined"},{"item_id":"UIS5065392","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_three_foot_geodetic_theodolite_1792","item_variant":"undefined"},{"item_id":"UIS5065363","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"telescope_used_by_general_roy_hounslow_heath_middlesex_1784","item_variant":"undefined"},{"item_id":"UIS5080550","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_three_foot_geodetic_theodolite_1792","item_variant":"undefined"},{"item_id":"UIS5065388","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_three_foot_geodetic_theodolite_1792","item_variant":"undefined"},{"item_id":"UIS5082154","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_18_inch_geodetic_theodolite_late_18th_century","item_variant":"undefined"},{"item_id":"UIS5065482","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"two_foot_geodetic_theodolite_made_by_troughton_simms_1828","item_variant":"undefined"},{"item_id":"UIS5079165","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_board_of_ordnance_three_foot_theodolite_1858","item_variant":"undefined"},{"item_id":"UIS5065590","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"ramsden_s_18_inch_geodetic_theodolite_1790_1800","item_variant":"undefined"},{"item_id":"UIS5087210","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"100_link_steel_and_brass_surveying_chain_1784","item_variant":"undefined"},{"item_id":"UIS5065439","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"100_link_steel_surveying_chain_1784","item_variant":"undefined"},{"item_id":"UIS5065411","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"two_foot_geodetic_theodolite_made_by_troughton_simms_1828","item_variant":"undefined"},{"item_id":"UIS5087322","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"100_link_steel_surveying_chain_1784","item_variant":"undefined"},{"item_id":"UIS5087331","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"100_link_steel_surveying_chain_1784","item_variant":"undefined"},{"item_id":"UIS5087332","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"100_link_steel_surveying_chain_1784","item_variant":"undefined"},{"item_id":"UIG673468","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"the_astrolabe","item_variant":"undefined"},{"item_id":"UIS5072583","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"satellites_military_usa_navstar_satellite_1986","item_variant":"undefined"},{"item_id":"UIS5087186","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"plan_of_the_base_measurement_on_hounslow_heath_summer_1784","item_variant":"undefined"},{"item_id":"UIS5072593","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"satellites_military_usa_navstar_satellite_1986","item_variant":"undefined"},{"item_id":"UIS5065372","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"colby_s_compensation_bars_ireland_1827_1828","item_variant":"undefined"},{"item_id":"UIS5065360","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"colby_s_compensation_bars_ireland_1827_1828","item_variant":"undefined"},{"item_id":"BAF7424776","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cleave_collection_2_survey_of_international_frontier_between_uganda_and_kenya_1959_1960_part_5_of_5","item_variant":"undefined"},{"item_id":"UIS5065370","item_category":"object","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"colby_s_compensation_bars_ireland_1827_1828","item_variant":"undefined"},{"item_id":"UIS5072597","item_category":"photo","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"satellites_military_usa_navstar_satellite_1986","item_variant":"undefined"},{"item_id":"UIS5101516","item_category":"illustration","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"meridians_of_the_royal_observatories_of_greenwich_and_paris_1799","item_variant":"undefined"},{"item_id":"PFH1773877","item_category":"object","item_category2":"undetermined_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"iran_persia_a_modern_brass_iranian_astrolabe_made_in_tabriz_in_2013_by_jacopo_koushan","item_variant":"undefined"},{"item_id":"MMM7339364","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category4":"unknown_artist_18th_century","item_category5":"not_balown","item_list_name":"search_results","item_name":"map_of_portoferraio_on_elba_c_1790_manuscript","item_variant":"undefined"},{"item_id":"BAF7424744","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cleave_collection_2_survey_of_international_frontier_between_uganda_and_kenya_1959_1960_part_1_of_5","item_variant":"undefined"},{"item_id":"BAF7424762","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cleave_collection_2_survey_of_international_frontier_between_uganda_and_kenya_part_3_of_5","item_variant":"undefined"},{"item_id":"BAF7424770","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cleave_collection_2_survey_of_international_frontier_between_uganda_and_kenya_part_4_of_5","item_variant":"undefined"},{"item_id":"BAF7424753","item_category":"footage","item_category2":"no_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"cleave_collection_2_survey_of_international_frontier_between_uganda_and_kenya_1959_1960_part_2_of_5","item_variant":"undefined"},{"item_id":"LZT5476183","item_category":"illustration","item_category2":"out_of_copyright","item_category3":"standard","item_category5":"not_balown","item_list_name":"search_results","item_name":"1864_u_s_coast_survey_map_or_trianguation_chart_of_new_england","item_variant":"undefined"}]}}

{"event":"custom_event","event_name":"view_search_result","event_category":"browse_catalog","keyword":"triangulation","search_type":"standard","search_bridgeman_artists":"false","search_mode":"automatic","search_zero_result":"false","search_results":84,"search_results_page_number":1}