WIRELESS TELEPHONES.

Evening Post, Volume LXIV, Issue LXIV, 13 September 1902, Page 7 (Supplement)

WIRELESS TELEPHONES.

A company is being formed, with a capital of £175,00Q, to exploit the Arm-strong-Orling system of wireless telegraphy and telephony. The new system is a domestic variety of the Marconi idea. It does not aim to stride over oceans, to make continent answer continent through the ate ; but is designed for short distances. The promoters claim that they are able to telegraph or telephone through the ground for a distance of five miles, and that the range will soon be, increased to twenty-five miles. "We can send oh» hundred letters," they $ay, "while Mr. Mift-coni is .signalling half-a-dozen, and <V 8 to telephones, you can have .one all complete for £5 a yew." The promise is certainly alluring. *The only question is —can it be fulfilled? An expert on wireless telegraphy, Consulted by the Express, is very doubtful about the success of the scheme. "In the Brat place," he *»ysi "you cannot adopt a public system of telegraphy or telephony without the license of tho Postmaster-General, and it is highly improbable that he will ever grant a license to private persons again. Even supposing you get the license, it would be impossible to establish a general system of wireless telephony. In such a system it should be able to communicate with every other subscriber. Yet the very fact of A trying to communicate with R would prevent C from communicating Tvith D. Tho message* would be jumbled up together. The only w«,y of preventing interference and interception is by 'tuning-—t hat w, making each pair of communicating instruments of a. different tune from all the rest. As booh as you do that you abolish the possibility of a free exchange of messages. No, wireless telegraphy, even as worked by Mr. Marconi, is not applicable to complicated cross work within a small urea. However carefully the toning may be done, interference and intercoption must tuke place when the instruments are close together." — Daily Express.