American telegraphy and encyclopedia of the telegraph
Subtitle: systems, apparatus, operation, embracing electrical testing ; primary and storage batteries ; dynamo machines ; Morse, duplex, quadruplex, multiplex, submarine, automatic, and wireless telegraphy ; burglar-alarm, fire-alarm, and police-alarm telegraphy ; printing telegraphy ; military and naval signaling ; railway block systems ; telegraph wires, cables, and conduits ; etc.
Publisher: Maver Pub. Co.
Published: 1912
Place of publication: New York