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- Letter from Albert B. Chandler to Marilla Stedman, October 14, 1863 - Albert B. Chandler served as a cipher operator at the War Department office in Washington, D.C., during the Civil War. He transmitted coded messages to and decoded messages from Union military field commanders. While at this post, he became acquainted with President Abraham Lincoln. Chandler describes some of his wartime experiences in this letter to Marilla Stedman, his future bride.
- October 14, 1863
- Collections - Artifact
Letter from Albert B. Chandler to Marilla Stedman, October 14, 1863
Albert B. Chandler served as a cipher operator at the War Department office in Washington, D.C., during the Civil War. He transmitted coded messages to and decoded messages from Union military field commanders. While at this post, he became acquainted with President Abraham Lincoln. Chandler describes some of his wartime experiences in this letter to Marilla Stedman, his future bride.
- Radio Headphones Used by Theodore Haubner While Transmitting the First "SOS" Distress Signal, August 11, 1909 - In 1909, telegraph operator Theodore Haubner sent the first American ship-to-shore wireless distress signal -- SOS. These headphones were part of his wireless equipment. Haubner was aboard the SS <em>Arapahoe</em> off Cape Hatteras, North Carolina, when it became disabled.
- August 11, 1909
- Collections - Artifact
Radio Headphones Used by Theodore Haubner While Transmitting the First "SOS" Distress Signal, August 11, 1909
In 1909, telegraph operator Theodore Haubner sent the first American ship-to-shore wireless distress signal -- SOS. These headphones were part of his wireless equipment. Haubner was aboard the SS Arapahoe off Cape Hatteras, North Carolina, when it became disabled.
- Spark Gap Transmitter, 1910-1925 - 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.
- 1910-1925
- Collections - Artifact
Spark Gap Transmitter, 1910-1925
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.
- Replica of First Morse Port Rule Telegraph -
- 1837
- Collections - Artifact
Replica of First Morse Port Rule Telegraph
- Edison Diamond Disc Record, "Charmant Oiseau (from La Perle de Brasil)" and a Message for Thomas Edison, 1915 - This rare recording was the brainchild of Thomas Edison's Chief Engineer Miller R. Hutchison. A group of Edison's friends and business associates gathered at Edison's West Orange, New Jersey, laboratory as this pre-recorded speech was played during a telephone call made to Edison over the newly completed transcontinental telephone line. Edison was visiting the 1915 Pan-American Exhibition in San Francisco on the opposite coast. This recording was never sold commercially.
- October 21, 1915
- Collections - Artifact
Edison Diamond Disc Record, "Charmant Oiseau (from La Perle de Brasil)" and a Message for Thomas Edison, 1915
This rare recording was the brainchild of Thomas Edison's Chief Engineer Miller R. Hutchison. A group of Edison's friends and business associates gathered at Edison's West Orange, New Jersey, laboratory as this pre-recorded speech was played during a telephone call made to Edison over the newly completed transcontinental telephone line. Edison was visiting the 1915 Pan-American Exhibition in San Francisco on the opposite coast. This recording was never sold commercially.
- Chester Telegraph Relay, 1850-1860 -
- 1850-1860
- Collections - Artifact
Chester Telegraph Relay, 1850-1860
- Insulator, Used by U. S. Merchant Marines, 1915 -
- 1915
- Collections - Artifact
Insulator, Used by U. S. Merchant Marines, 1915
- Western Electric Company Resistance Box, circa 1910 -
- circa 1910
- Collections - Artifact
Western Electric Company Resistance Box, circa 1910
- Brookfield Glass Company Insulator, Used by Postal Telegraph-Cable Company, 1882-1889 - Insulators--made of poor electrical conductors such as glass, ceramic, plastic, or composite materials--help make electric power and communication transmission lines safe. They isolate wires from utility poles, transmission towers, and buildings--structures that are made of conductive materials that could cause signal degradation, power loss, fire, or pose a shock hazard if the lines touched them.
- 1882-1889
- Collections - Artifact
Brookfield Glass Company Insulator, Used by Postal Telegraph-Cable Company, 1882-1889
Insulators--made of poor electrical conductors such as glass, ceramic, plastic, or composite materials--help make electric power and communication transmission lines safe. They isolate wires from utility poles, transmission towers, and buildings--structures that are made of conductive materials that could cause signal degradation, power loss, fire, or pose a shock hazard if the lines touched them.
- Patent Model of Edison's Printing Telegraph Improvement, 1872 -
- 1872
- Collections - Artifact
Patent Model of Edison's Printing Telegraph Improvement, 1872