GENERAL CABLES WIRELESS TELEPHONY

Evening Post, Volume xc, Issue 79, 1 October 1915, Page 8

GENERAL CABLES WIRELESS TELEPHONY

REMARKABLE PROGRESS SPEECH OVER 4600 MILES. <By Tolejraph.— Prws Association.— Copyright.) (Received October 1, 1.30 p.m.) NEW YORK, 30th September. Wireless telephone messages have been exchanged between Arlington, Virginia, and Honolulu, 4600 miles distant. The Government's experiments in wireless telephony have resulted in exceptional success, and transcontinental speech is now quite easy. [Wireless telephony has made very rapid progress in recent years, for it is only since 1913 that it has been in the practical stage. Wireless transmission of any sort of message depends upon the setting up of waves in the ether by some form of intermittent electrical discharge. The necessary vibrations are easily obtained for telegraphic purposes, but for the transmission of speech they must follow each other with such frequency that they do not themselves give a musical note in the receiving instrument. The speech waves are made to vary the strength of the current at rates corresponding to the vibrations of the voice, and the waves sent out in the ether vary correspondingly. The transmitting apparatus is therefore on a different principle from that of a telegraph.' In one class of apparatus an electric arc is used to create the waves, and tho volume of electricity consumed is varied by being passed through a telephone transmitter with a special form of microphone capable of carrying the big current. Speech can be transmitted with great clearness over short distances, but as a rule long distance work can only be undertaken by experts, and the weak sounds have to be skilfully magnified. At the end of 1913, speech was transmitted between London and Berlin. Since then it has been practically applied to communication between ships up to about 100 miles.] DISABLED STEAMER TOWED TO PORT (Received October 1, 8.10 a.m.) ADELAIDE, This Day. "■The steamer Yeddo, which was disabled with a broken tail-shaft 200 miles gouth-east of Albany, has been towed in. SENTENCED TO DEATH ■ \ " (Received October 1, 8.10 a.m.) CAIRO, 30th September. The assailant of Fathy Pasha has been /Sentenced to death. ■ [An employee of the Ministry of Finance made three attempts to wound Fathy Pasha, Minister for Pious Founda- ; iions, with a knife.]