WIRELESS TELEPHONY.

Dominion, Volume 2, Issue 532, 12 June 1909, Page 5

WIRELESS TELEPHONY.

A FRENCH FEAT. T SPEAKING OVER A HUNDRED MILES. (Br TEKOEAPH—MESS ASSOCIATION—COPIBIQHT.) Paris, Juno 10.'. A , conversation by means of wireless telephony lias been carried on between Toulon and a French cruiser a hundred miles out. Messages reached the officers in their cabins.

PROGRESS IN WIRELESS TELEPHONY. In the opinion of some experts,wireless telephony will not be able to rival the' long distance perfection of wireless & long time to come, but they regard it as likely to supplant telegraphy for short-distance work. As to long-distance. Wireless telephony, Professor llarohant told the Liverpool Engineering Society last January that if its, development were as rapid aa that of wireless telegraphy, within the next ten years it would probably, be possible to telephono without wires, not only to any ship crossing the Atlantic, but to any. oity within a radius of 2000 to 3000 miles. The shore-to-ship conversation carried on over one hundred miles by' the French taaval authorities, reported to-day, is a remarkable feat. Mr. Poulsen, the great Danish inventor, claims to have telephoned without wires for much greater distances.. Sound Converted Into Waves. Tho simplest form of wireless telephony is to shout. But Mr. Poulsen does not shout from Denmark to England. What does he do P Writes "E.E.H." in a London paper:— "The wireless telephono requires some agency to work with.. Do not imagine that it is possible to a say a few words into a telephone, conneoted with nothing, and for someone a mile away to hear what you say without any intermediary power. "If you send someone a sovereign, and to do so buy a postal-order and send it through tho post, the recipient casheu the ordor and gets his gold piece. The postal-order was the means by which the gold was transmitted. •■ It is just the same in wireless telephony. You speak into a telephone, connected by no wires with the reoeivor, and your words are converted into something else—in this case merely modified electrical waves ."These waves are sent through the air or the earth, always bearing upon them the impression made by the speech, and when they arrive at the receiving post they are once again converted into sounds. The electric waves are _ analogous to the postal-order, the earth or air to the post. Tho waves possess a subtle and latent value which can be exchanEed for the original words spoken." Mr. Poulsen's Work. . According to another authority, "wireless telephony, or radw-teUphony, is tfie invenKra of Mr. Valdemar. Poulsen, of Copenhagen The first transmitting station was erected at Lyngby. (near Copenhagen) in June, 1905. Foiling a, first experimental receiving station nine miles away, a station was erected at Esbjerg, on the west coast of;Jutland,,lßo'miles away, where good telephonic signals were obtained After wards a station was put up at South Shields 530 miles away 150 miles of which were ove> and: A mast 100 ft. high and a power of one kilowatt proved sufficient for perfect commu! nication., . ■ * . "There is a station also at CuUercoats near Tyneniouth, and one at Hartland Point, in North Devon. Practically the same apparatus is used for elegraphic and telephonic communica of fj h l- b , e P°, sslble to across the Atlantic. The only addition renuircd is microphones coupled with the oscillating apparatus "