WIRELESS TELEPHONY.

Taranaki Daily News, Volume LI, Issue 280, 20 November 1908, Page 4

WIRELESS TELEPHONY.

HECJSXT rammMAXcKs. In the opinion of some exports, wireloss telephony will not be able to rival the long distance perfection of wireless telegraphy for a long time to come, but they regard it a* likely to .supplant telegraphy for .short distance work. The above cablegram secnis to indicate that i wireless telephony, like wireless telegraphy. has now definitely entered the commercial arena. The operation o |' this thirty-mile radius system of wircle>s telephony in Paris will lie watched wilh much the same interest as centres in Mr. Marconi's 2(1110 miles wireless telegraphy installation across the Atlantic/ 3 The shilling a word oahle companies are already confronted with Mr. Marconi's,ttvcpenuy rate; 110 doubt the short-distance land lines will soon have to consider the same sort of competition from wireless telephony. The following are some of the latest results obtained by wireless telephony experiments, and it will lie noted that France takes a leading place. Under date August 17th, the Paris correspondent 01 the London Daily .Mail states:—'\Somo astonishing results with tin; Wireless telephone were obtained yesterday at the Eiffel Tower ■wireless Station IjV ]S*aval Lieutenants Colin and Jeance and Chief-Engineer Mercier, who last week successfully ,spoke from Paris to Dieppe. Yesterday, having effected various modifications in the instruments they have bceu using in connection with these experiments, the above-named olliccrs •endeavoured to telephone by wireless from the Eiffel Tower to the wireless station at Poiate de Uaz, on the coast of Finisterre, distant 310 miles from (Paris. The experiments began ?n the nearly hours of the morning, that being judged the most favourable lime. During the lirst hour or so the sound of | a motor-horn, the ringing of a bell, a song oil the gramophone, etc.. were transmitted and heard distinctly. Then | voice messages were sent through, ami although they were very faint and not always clear, several of the phrases -transmitted were understood. !'. is believed that this is the first time conversation has taken place over such a great distance.'' The Xew York correspondent of the same paper writes under date August 2(ith"With the beginning of the new year wireless communieat inn betw -en N'ew York and Paris will, it is hope!, be an. established fuel. Dr. Leo de Forest tells Hie that the contract h<' has signed with the French Covernment provides for (he immediate commencement ot experimental work between the French military station on the Eiffel Tower and a station he will erect : n October on Hie lower of (lie Metropolitan Life building in Now York, the liigheM inhabited building in I lie \torld. ' Owing to the immense altitude of both station*.' he observed. ' \vc have a great advantage over Mr. Marconi. Moreover, we are independent of the brad Mo- - graph companies, who have imposed all possible hindrances to Ute wireless system. From the roof of the Metropolitan Life building, where the power station will be fixed, to the (op of the tower, a distance of "Mft., antennae in the shape of six or seven copper wires will be fastened.' Mr. de Forest is also convinred that it will soon be possible to telephone from New York to Paris, i UTid assures uiu tlmt fcy is confident that

within two years lie will so perfect his apparatus as to eniliie wireless telephony to be definitely established between this city, li.istoii, Montreal, Chicago, Havana) and Pari*."

The British Navy ha* not been id!''. On October 2nd the Daily Mail stated: — ("V«ry satisfactory results bav;'attended the -wireless telephony tests which liaVe been taking place during the past few days on board British warships at Portsmouth. The de Forest instruments were installed iu the Furious, a small cruiser used for experimental work, and satisfactory conversations have been carried on by the system with the Vernon torpedo school ship over distances oi between twenty and thirty miles. It is stated that on some occasions the messages were so clear that the voice of the person speaking could be recognised"

Mr. Valdemar Poulsen, the Danish inventor of tile "undamped" or continuous (as opposed -to tli'c scricg of vivid sparks) system of wireless transmission, has communicated with the wireless telephone over 240 miles, and is said to have once succeeded in increasing the distance to 520 miles, and to have com-" municiited with North Shields from) Copenhagen. I