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- Patent Model of Edison's Printing Telegraph Improvement, 1872 -
- 1872
- Collections - Artifact
Patent Model of Edison's Printing Telegraph Improvement, 1872
- 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.
- 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.
- Western Electric Company Resistance Box, circa 1910 -
- circa 1910
- Collections - Artifact
Western Electric Company Resistance Box, circa 1910
- Replica of First Morse Port Rule Telegraph -
- 1837
- Collections - Artifact
Replica of First Morse Port Rule Telegraph
- Telegraph Sounder, 1850-1900 -
- 1850-1900
- Collections - Artifact
Telegraph Sounder, 1850-1900
- Patent Model of Edison's Sextuplex Telegraph, 1879 -
- 1879
- Collections - Artifact
Patent Model of Edison's Sextuplex Telegraph, 1879
- Patent Model of Edison's Acoustic Telegraph Improvement, 1876 -
- 1876
- Collections - Artifact
Patent Model of Edison's Acoustic Telegraph Improvement, 1876
- Patent Model of Edison's Printing Telegraph Improvement, 1872 -
- 1872
- Collections - Artifact
Patent Model of Edison's Printing Telegraph Improvement, 1872
- AT&T Bell System Advertisement, "Thousands of Improvements in Central Office Equipment in 5 Years," July 1929 -
- July 01, 1929
- Collections - Artifact
AT&T Bell System Advertisement, "Thousands of Improvements in Central Office Equipment in 5 Years," July 1929