AVE6321674: United States, 1940s: Woman opens piano top, sprays pesticide inside / Bridgeman Images

AVE6321675: United States, 1940s: Hand sprays pesticide on ant hill / Bridgeman Images

AVE6321676: United States, 1940s: Woman sprays pesticide on dog / Bridgeman Images

AVE6321677: United States, 1940s: Hands spray pesticide from canister / Bridgeman Images

AVE6321681: United States, 1940s: Close up of mosquito dying / Bridgeman Images

AVE6321914: 1940s: Animation of globe zooms in on United States and then New York and Boston / Bridgeman Images

AVE6321965: Man Works at His Desk as Wife Arrives Home with Shopping / Bridgeman Images

AVE6321968: Sun Streaming through Clouds in Sky Before Raging Storm Begins / Bridgeman Images

AVE6321982: Men Build Turbine / Bridgeman Images

AVE6321985: Man Types on Type Writer / Bridgeman Images

AVE6321988: Men Building a Large Transformer / Bridgeman Images

AVE6321994: Machines inside a Factory / Bridgeman Images

AVE6321996: Man Fells a Tree / Bridgeman Images

AVE6322003: Mechanical Energy Generated on a Machine / Bridgeman Images

AVE6322017: United States, 1950s: man talking to another man, man bends down to pick up something, man walks away, workbench, close up of equipment / Bridgeman Images

AVE6322021: United States, 1950s: man walks into room, man speaks to another man sat at desk / Bridgeman Images

AVE6322022: United States, 1950s: close up of man face speaking, 2 men speaking to each other / Bridgeman Images

AVE6322025: United States, 1950s: man speaking on phone, man approaches man on phone and points him to another man, man hangs up / Bridgeman Images

AVE6322026: United States, 1950s: man busy at work, man approaches man in lab coat, 2 men talking / Bridgeman Images

AVE6322035: United States, 1950s: Man cuts into rubber tree / Bridgeman Images

AVE6322042: United States, 1950s: Yard spool superimposed over fabric / Bridgeman Images

AVE6322045: United States, 1950s: Long shot of circus tents, road / Bridgeman Images

AVE6322050: United States, 1950s: Men carry pallets of cotton candy / Bridgeman Images

AVE6322053: United States, 1950s: People exiting bus, Firestone plant in background / Bridgeman Images

AVE6322054: United States, 1950s: Crowd in front of Firestone circus tent / Bridgeman Images

AVE6322061: United States, 1950s: Woman doing aerial acrobatics / Bridgeman Images

AVE6322068: United States, 1950s: Audience in stands at circus / Bridgeman Images

AVE6322069: United States, 1950s: Pan of audience in stands at circus / Bridgeman Images

AVE6322071: United States, 1950s: Clowns at circus, clown thrown into bag / Bridgeman Images

AVE6322077: United States, 1950s: Woman balances on her head on trapeze / Bridgeman Images

AVE6322120: 1940s: Fleets of fishing boats on a fjord / Bridgeman Images

AVE6322127: 1940s: Men haul nets and floats onto fishing vessel / Bridgeman Images

AVE6322138: 1940s: Power windlass pulls fish and nets onto boat / Bridgeman Images

AVE6322144: 1940s: Flock of seagulls near boats / Bridgeman Images

AVE6322161: 1940s: Men bundle and hang large fishing nets on dock / Bridgeman Images

AVE6322162: 1980s: A hand touches the nose of a model airplane / Bridgeman Images