WIRELESS

Waimate Daily Advertiser, Volume XXIV, 9 April 1927, Page 8

WIRELESS

MESSAGES BETWEEN ENGLAND AND AUSTRALIA. SUCCESSFUL PRESS TRIALS. (Per Press Association —Copyright. LONDON. April 7. No fault could be iound with this afternoon’s first press trial of the G.P. 0. beam, which worked splendid> ? [ and within the safe limit of one I hundred words per minute. It was un- j canny to watch the Wheatstone automat e transmitter on one side of the operator swallowing up yards of lace-like Morse tape, while simultaneously on his left hand the printer was reeling off dots and dashes coming from Eallan Journalists 1 greetings literally swamped the editor for more than an hour, during which time only once or twice was there any suggestion of fading, but never enough to make the incoming tape unreadable. In fact the signals the whole time were adjudged sufficiently strong to work the Creed automatic printer for direct delivery of addresses. Perhaps a new invention in the near future would make tbe~» preselit apparatus seem very slow: Even if there were fading there would be sure to be a thirteen hours standard transmission daily. The London business day did not overlap Australia’s, and even with fading, it was fully certain that* ; a Jxmdoner’s message would b e waiting si Melbourne or Sydney man on his office desk before his arrival. | The Post Office engineers do not intend exploring the - possibilities ot telephony by the Australian beam till the shorter Canadian beam is satisfactorily harnessed for that purpose towards which considerable progress . .already has been made. The African - and Indian team stat ons w'll shortly begin an ipgeninn? plan devised to assist in a mutual tuning adjustment ♦a. at both ends of the Australian beam. When fading or other difficulty arises the operator hero inserts a transmitter ►.• *et to agreed signa's on the morse

tape gummed to form a circle ‘■-continuously feeding through the instrument which keeps send ng out the same calls till Me’bc-rn e answers, and is getting then clearly, and the is workab’s.

SYDNEY, April 8. The Beam Wireless Office has opened for public business, and is being well patronised.

TELEVISION DEMOSTRATION

NEW YORK, April 7. The first public demonstration of television, or visible radio, was held at the laboratory of the Bell Tele-

phone Company. A group of fifty men simultaneously heard and saw Mr Hoover deliver a radio address from Washington. The invention is the work of Francis Jenkins, a Washington scientist, who is now working on a machine to be carried by an aeroplane in time of war, to take ■ impressions of land-

icapes over which it is flying, and ransmit the- photographs, hundreds

of miles back to a projection screen at headquarters.

Mr Jenkins invented the modern cinema projection machine, also the transmission of still pictures by the radio instruments now in use, by

which weather maps can be transmitted from the shore to ships at sea. The same experiment was also repeated by a telephone wire, with equal results, the synchronisation of the speaker's voice and actions being, extremely lifelike. Although verisimilitude was more nearly approached when the picture was projected on a small screen, Eighteen pictures per second were projected a distance of 250 miles on a screen 2in. by 3in., then a screen 2ft by 3ft., after which Mr Curty (vice-president of the American Telephone and Telegraph Coy.), in Washington, conversed individually with New York, looking each straight in the eye, while upon the screen before him he saw the individuals whom he addressed. This was followed by the projection of a variety entertainment from a studio in New Jersey, into New York, by tvjreless. This is a much shorter distance, and the effects were excellent.