Publicado por New York c. 1895, New York, 1895
Librería: High Ridge Books, Inc. - ABAA, South Deerfield, MA, Estados Unidos de America
EUR 88,87
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Añadir al carrito24 pp. An interesting training device for prospective telegraphers, the Omnigraph has a dial for spelling out messages which would then be sent in Morse Code. There is also a different machine with a QWERTY-type keyboard for practice in listening to the sounds.