Wireless Telegraphy and Telephony

 102 WIRELESS TELEGRAPHY former. Pressing the key, the operator then signals in the telegraph code j. h., j. h., j. n.—m. s. g.—n. y.—and gives the “finish” signal. M. S. G. is the abbreviation for message. The N. Y. operator then throws his switch back into the receiving position and waits for a reply. If one is not forthcoming shortly the calling process is repeated. As soon as the operator on board the steamer hears the call, he waits until the finish signal is received, and then Fig. 118.—Breaking-in system. responds in the following manner : n. y., n. y., n. y.—j. h. •—o. k.? o. k.—g. a.—g. a.—n. y., j. h.—and gives the “fin- ish signal.” O. K. is the abbreviation for “all right,” and G. A. means “go ahead.” Upon receipt of this, the land station transmits the body of the message, and signs its call and finish signal. If the steamer understands the mes- sage, she replies “O. K.,” and signs. There are two Codes in general use for wireless tele- graph purposes, the Morse and Continental. It takes about five per cent, longer space of time to send a message in Continental than it does in Morse, but the former has the advantage of not containing any letters requiring proper