Editore: New York c. 1895, New York, 1895
Da: High Ridge Books, Inc. - ABAA, South Deerfield, MA, U.S.A.
EUR 92,03
Convertire valutaQuantità: 1 disponibili
Aggiungi al carrello24 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.