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- German Field Telephone, circa 1915 -
- circa 1915
- Collections - Artifact
German Field Telephone, circa 1915
- 2KW Radio Transformer and Reactance, 1917 -
- 1917
- Collections - Artifact
2KW Radio Transformer and Reactance, 1917
- Lowenstein Quenched Spark Gap Transmitter, Type A-16G, Used aboard the USS Rowan, circa 1916 - Spark gap transmitters were the first means of practical radio transmission for the first thirty years of radio development. By the end of WWI, vacuum tube technology advanced sufficiently, replacing the spark gap. Even though the vacuum tube ensured more efficient and reliable transmissions, commercial use of spark gap transmitters continued up until WWII as back-up transmitters.
- circa 1916
- Collections - Artifact
Lowenstein Quenched Spark Gap Transmitter, Type A-16G, Used aboard the USS Rowan, circa 1916
Spark gap transmitters were the first means of practical radio transmission for the first thirty years of radio development. By the end of WWI, vacuum tube technology advanced sufficiently, replacing the spark gap. Even though the vacuum tube ensured more efficient and reliable transmissions, commercial use of spark gap transmitters continued up until WWII as back-up transmitters.
- Power Source for Navy Radio Transmitter, 1918 -
- October 01, 1918
- Collections - Artifact
Power Source for Navy Radio Transmitter, 1918
- Military Suitcase Radio, 1940-1945 -
- 1940-1945
- Collections - Artifact
Military Suitcase Radio, 1940-1945
- Elbow Wave Guide, 1940-1946 -
- 1940-1946
- Collections - Artifact
Elbow Wave Guide, 1940-1946
- Nichols Loose Coupler Radio Tuner, 1913-1914 -
- 1913-1914
- Collections - Artifact
Nichols Loose Coupler Radio Tuner, 1913-1914
- Letter from George Washington to General Israel Putnam, 1776 -
- May 22, 1776
- Collections - Artifact
Letter from George Washington to General Israel Putnam, 1776
- 2KW Radio Transformer, 1918 -
- 1918
- Collections - Artifact
2KW Radio Transformer, 1918
- Western Electric Carbon Microphone, Type CW 930, 1916-1918 -
- 1916-1918
- Collections - Artifact
Western Electric Carbon Microphone, Type CW 930, 1916-1918