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United States CIRCA 1940s: Boy watches a young man mark angles on a paper. He draws angles from each end of a line to form a new triangle. He compares the new triangle to the triangle on a blueprint.
1960s: Animation of rechargable battery interior with negative and positive electrodes.
UNITED STATES 1960s: Animation of air currents in shafts / Air currents in hall / Smoke travels under door.
abstract motion lines blocks background
1960s: Intertitle shows three cuboids with number labels. Two shapes appear to the left and right of cuboids.
1980s: Drawing, earth casts layered shadows, arrow points. Light, shadow, planet.
1940s: Electrical current flows through alternating flow single phase circuit, piston pumps.

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1068909347

Stock Video ID: 1068909347

1960s: Animation of electric charge running and changing in nickle cadmium battery, flowing in and out battery.

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