WIRELESS TELEGRAPHY.

Wairarapa Age, Volume XXV, Issue 10713, 3 May 1913, Page 5

WIRELESS TELEGRAPHY.

CABLE NEWS

(United Press Association—By Flu trie Telegraph—Copyright.)

REPORT OF POSTMASTER'S COMMITTEE. ONLY ONE EFFECTIVE SYSTEM. (Received La.st Night, 5.5 o'clock.) LONDON, May 1. The Postmasters' Committee set up by the House of Commons has reported that the Foulsen system nt ; wireless telegraphy is practicable for short distances, but the Marconi system is at present the only one which it can be said, with any degree of certainty, is capable of fulfilling the requirements of the Imperial chain. This -must not, the report says, bo regarded as implying that the Marconi Company must necessarily be employed as contractors for all work in connection with the Imperial chain. Wireless telegraphy is, it says, in a condition of development. Hence, in the construction and equipment of statoins, it is undesirable that the Post Office should be pledged to the continued use of any apparatus or any so-called system. It, is imperative to reserve complete liberty of action. The Committee report that, despite the invitations that were, given, no demonstration on a commercial scale over a distance of 7000 miles were obtained, except by the Marconi system. The latter was working 23(M) miles between Clifden and Glace Bay on a commercial scale. The Committee say that the Clifden transmission was at the rate rvf sixty words per minute, which, if necessary, might be considerably exceeded. Communication was practically continuous, but there were occasional periods when the signals were weak, or suspended, owing to natural conditions. Communication was only obtainable by great power in the aerial. Heno? owing to the increased power required, and the high speed of transmission, the Marconi system was proposed to be applied to Imperial stations. Double power would be employed at Clifden, and even then the Committee anticipate periods of stop page, especially in tropical regit Practically, the Telefunken system on a commercial scale could be used over a distance of 2000 miles. This could be improved upon as a result of the present experiments, and 4(M,i) miles might I'" reached, between Nauen and Togo. This indicated that communication was possible at uiglit.

Tf the Poulsen system wag to lie made oommejreiariy ov<r '2OOO miles and upwards,- the arc must be so constructed as to supply an aerial with a higher power, or a more sensitive receiver must be used. The Committee referred in similar terms to thn Oohlschmidt system sit Hanover. This only required a powerful machine to make it practicable over a long distance. The Poiilsen and Goklschmidt systems wore admirably adapted for high spp; d t.rn n KinissioOT. The Post Office xhonkl, says the CV-nnnit.tee, whatever system is adopted, :nsist I'Don high powers for the Imperial chain, i'crbaps in -some respects it was dcHsirahle that the Government themselves cconstruct anil equip the stations. The development of wireless telegraphy would probably involve the n 1 timate substitution of high frequency generators, prodxicing continuous oscillations, for those dependent on spark discharges, which produced groups of oscillations. The Post Office should be free to employ or experiment, in the develop--nmi of the wireless system of tele-, gvapliy. There, was eio reason why, under a highly-skilled engineer anc expert staff, the rost- Office stations should not ultimately be equipped with apparatus far more efficient than that now used by any so-called "system."