WIRELESS TELEPHONY.

New Zealand Herald, Volume XLVI, Issue 14144, 20 August 1909, Page 5

WIRELESS TELEPHONY.

A SUCCESS IN FRANCE. By Telegraph.— Association.—Copyright

(Received August 20, 12.30 a.m.)

Paris, August 19. Lieutenant Jeance Colin's system of wireless telephony is working successfully from Toulon to Port Vendres, in France.

PROGRESS IN WIRELESS TELE-

PHONY.

In the opinion of some exports, wireless telephony will not bo ablo to rival the long distance perfection of wireless telegraphy for a long time* to come, but. they regard it as likely* to supplant telegraphy for shor't-disfanco work. As to longdistance wireless telephony, Professor Marchant told tho Liverpool Engineering Society last .January that if its development were as rapid as that of wireless telegraphy, within .the. next 10 years it would probably ba possible .to telephone without wires, not only to any ship crossing the Atlantic, but to any city within a radius of 2000 to 3000 miles. Wireless telephony, or radio-tele-phony, is the invention of Mr. Valdcmar Poulson,' of -Copenhagen. The first transmitting station was erected at Lyngby (near Copenhagen), in June, 1905. Following a first. experimental receiving station nine miles away, a station was erected at Esbjerg, on the west coast of Jutland, 180 miles away* whore good telephonic signals were ..obtained. Afterwards a station was put up at South Shields, 530 miles away, 150 miles of which were overland. A mast, 100 ft high and a power of one kilowatt proved sufficient for perfect communication. There is a station also at Cullorcoets, near Tynomouth, and ono at Hartland Point, in North Devon. Practically the same apparatus is used for telegraphic and telephonic communication. The only addition required is microphones coupled with the oscillating apparatus.