Telegraph key is a general term for any switching device used primarily to send Morse code. Similar keys are used for all forms of manual telegraphy, such as an electrical telegraph and radio telegraphy.
KeywordsMorse code, Telegraph, straight keys, radio telegraphy, electrical telegraph, glass arm, telegraphers paralysis
GalleriesTelephone and Telegraph Industry
Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)