AVE6321644: United States, c.1950: Traffic officer directs traffic / Bridgeman Images

AVE6321653: United States, 1940s: Zoom in on scientists in lab, scientist swirls liquid in beaker / Bridgeman Images

AVE6321658: United States, 1940s: Close up, woman paints pesticide on door / Bridgeman Images

AVE6321666: United States, 1940s: Woman takes book from shelf, zoom in to her sitting in chair / Bridgeman Images

AVE6321667: United States, 1940s: Man paints pesticide under patio door / Bridgeman Images

AVE6321671: United States, 1940s: Man paints pesticide around drain / Bridgeman Images

AVE6321915: 1940s: Girl sits in helicopter, reads paper, boy points at paper, girl nods / Bridgeman Images

AVE6321967: Husband Reads his PhD Research Paper to his Wife at Home / Bridgeman Images

AVE6321970: Corn Growing in a Field / Bridgeman Images

AVE6321971: Man Loading Bails onto a Machine in Field / Bridgeman Images

AVE6321974: Diagram of an Electrical Energy Production Facility / Bridgeman Images

AVE6321981: Men Turn Turbine / Bridgeman Images

AVE6321986: Transformers in a Transmission System / Bridgeman Images

AVE6321989: Man Working at a Typewriter / Bridgeman Images

AVE6321998: Tram Powered by Overhead Cables / Bridgeman Images

AVE6322005: Woman Does Family Washing Over a Wash Tub / Bridgeman Images

AVE6322006: Woman Puts Washing Machine On / Bridgeman Images

AVE6322011: Doctors Examine Woman's Internal Organs with a Flouroscope / Bridgeman Images

AVE6322012: Man Turns on Television / Bridgeman Images

AVE6322015: United States, 1950s: man talking on phone, man hangs up phone, man walks away / Bridgeman Images

AVE6322019: United States, 1950s: man talking to another man, man points finger at another man, man walks away from another man / Bridgeman Images

AVE6322024: United States, 1950s: man picks up telephone, man speaking on telephone / Bridgeman Images

AVE6322031: United States, 1950s: Swirling orange liquid / Bridgeman Images

AVE6322033: United States, 1950s: Gas station attendant cleans car windshield / Bridgeman Images

AVE6322036: United States, 1950s: Man in factory adjusts valve / Bridgeman Images

AVE6322039: United States, 1950s: Invitation to Firestone Exhibition / Bridgeman Images

AVE6322040: United States, 1950s: Long shot of rubber plantation / Bridgeman Images

AVE6322056: United States, 1950s: Views of audience at circus / Bridgeman Images

AVE6322057: United States, 1950s: Views of audience at circus / Bridgeman Images

AVE6322076: United States, 1950s: Woman balancing on trapeze / Bridgeman Images

AVE6322124: 1940s: Men in heavy coats and mittens row boat through fjord / Bridgeman Images

AVE6322128: 1940s: Power windlass pulls fish and nets onto boat / Bridgeman Images

AVE6322158: 1980s: Wright brothers reenactor pull their flying machine to the top of a hill and then run down with it / Bridgeman Images

AVE6322160: 1980s: A man examines and shapes a model of an airplane / Bridgeman Images

AVE6322165: 1980s: A machine writes data on graph paper / Bridgeman Images

AVE6322169: 1940s: Long racks of drying fish on docks of fjord / Bridgeman Images