Edité par New York c. 1895, New York, 1895
Vendeur : High Ridge Books, Inc. - ABAA, South Deerfield, MA, Etats-Unis
EUR 86,76
Autre deviseQuantité disponible : 1 disponible(s)
Ajouter au panier24 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.