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Circa 1942 - lee de forest's discoveries lead to the invention of the radio, revolutionizing communications.
Circa 1942 - animation is used to illustrate guglielmo marconi's discovery of electromagnetic waves.
CIRCA 1950s, A narrator explains how Earth's globe shape creates different climates
CIRCA 1940s - US merchant marines deliver supplies to ports in Australia, England, India, and Russia in 1942.
CIRCA 1950s - A toy plane flies through time zones on a toy globe in this 1950s educational film
CIRCA 1970s - Students learn about communication systems at Fort Bliss as part of their military training for air defense in the 1970s.
1950s: Portrait of man. Field. People pick crops.

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1100555321
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Stock Video-ID: 1100555321

Circa 1942 - developments from the earliest telegraph, telephone, and radio are compared to where those communications systems stand in 1942.

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Bildhastighet

  • 23.98 fps

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  • 1:13

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