lightbulb

1960s

90002_7925_06

Man calculates with slide rule. Metal refinery machines spit flame.…

1960s

90002_7152_27

Train riding down track. Art deco Elevator door closing. Round saw…

1960s

90002_7152_11

Man with large magnet is pulled up the front of a barn, the magnet…

1960s

90002_7152_10

CU of simple circuit with conductors, battery, and lightbulb. Man…

1960s

90002_7152_07

Man assembling electrical circuit with wires, alligator clips,…