DEVELOPMENT OF WIRELESS

Otago Daily Times, Issue 18549, 9 May 1922, Page 4

DEVELOPMENT OF WIRELESS

SIR OLIVER LODGE ON ‘ TUNING. w CLAIM AGAINST THE AD MIR ALTS’. (Fbom Otjb Own Coeeespondent.) LONDON, March 14. Sir Oliver Lodge gave evidence before the ' Royal Commission on Awards to Inventors in a claim made by the Lodge Miiirhead ' Syndicate (Ltd.) and the Marconi Wireless • Telegraph £o. (Ltd.), in respect of wireless ' telegraph apparatus, the patent of Which,' , ft is alleged, has been infringed by the ’ Admiralty. Mr Marconi and Mr Godfrey Isaacs were present. . ■ Sir Oliver Lodge explained how jn the . early stages of wireless telegraphy thw method of signalling was by sudden jerks. Under these conditions Bo selection was possible. Every station, would excite ‘iaii others within range. It worked ‘only be- ' cause stations were few and far between;' If wireless were to develop and if stations ’ were to become numerous it would be essential to speak to one and exclude; others. This could be achieved on a principle like that of an organ note instead of a whip ’Crack, provided they had a receiver .or ; resonator which could be synchronised with ' the Radiator, and which would be incapable . of responding unless it was so: synchronised or properly attuned. This could only be * done by the introduction of self-induction ; in conjunction with capactiy. ‘‘Up to -the time of my patent,” said Sir Oliver, “neither pf these ideals had, entered wireless tele- ’ graphy.” EXCLUDING THE "OTHERS.” . H(3 then gave a technical description of big invention, and explained how, by, this , device ' of signalling on different wave lengths all the complexity of modern wireless telegraphy became- possible, ancL any ■ one j station could henceforth be listened to, to 1 the exclusion of all others'. ‘The value \ol the invention is incalculable,” declared Sir " Oliver, "for without it modern ' wireless • would be impossible.” He added that the ' method disclosed in the patent was inevitable, and. was in universal use. Anyone listening at even an amateur wireless, re- , ceiving set, first to a long wave station liKe the ' Eiffel Tower in Paris, then to ■ ships in the Channel on t,medium wave length, then to some great station such, aa Berlin,, then to a short wave amateur 'set, then to an aeroolanc operator overhead, . and 1 then back 5 again to Paris, and who realised' how completely silent the others were while one kind was being listened to, though they, might be all going on at the same time, could not fail to be impressed with the perfection which tuning had attained and bow absolutely vital it was to modern wirelesstelegraphy.