RETURN OVER THE SEA

Radio Record, Volume I, Issue 49, 29 June 1928, Page 15

RETURN OVER THE SEA

DAILY PHOTOGRAPHS A. short time ago Captain Ranger, a well-known wireless expert went to Britain from America for the purpose of setting up his instruments for send. ing pictures by ‘vireless. The machines were installed at the top of Radio House, In London, where wireless telegrams are despatched day, and night to all parts of the world, The first tests were successful. and, although not a great deal has been gaid about them, a regular datiy ser -yviee has been:established, and photo. graphs are sent by wireless to New York every evening. How the Pictures are Sent. PHOTOGRAPH to be sent across the Atlantic is printed on 2a celluloid film, and this transparent ‘picture as the cylinder revolves, and inder. The rays from a powerful electric lamp are passed through the picture is wrapped round a glass cylare then focussed 6n a photo-electri¢ cell, This celi generates a feeble elec: tric current when light falls upon it, and the current is amplified by valves until it is of sufficient power to operate a telegraph key. ‘The key works the ordinary transatlantie wireless current, and thus electric signals corresponding to the light and dark parts of the photograph are sent across the sea. By Land Line and Wireless. ACTUALLY _the picture telegram is sent over the ordinary land line to Carnarvon, where it is converted into wireless, It is again converted on the other side of the Atlantic into ordinary telegraphic current, and sent overland to the very heart of New, York city, where the receiving instrument is housed. Captain Ranger watches the fate of the picture on its journey across the sea The wireless signals sent from the great Carnarvon station reach London as well, of course, and they are picked up by an aerial on the roof of Radio House, and made to work a duplicate receiving machine side by side with the sending apparatus. The picture is produced on the receiver by an electric pen, which dots a sheet of paper with ink cach time a signal is received from the aerial. It is thugs possible to watch the photograph being reproduced, and if it is not quite perfect, the duplicate instrument chows what alteration is needed. 1000 Machines Ordered in U.S.A. GOOD deal of trouble has been | experienced with atmospherics, 'and the time of sending a picture has | peen lengthened from ten minutes to about half an hour. But the photographs sent in this time a distance of 3000 miles, are being used every day in the American newspapers, and there is no doubt that as time goes on, we shail get accustomed to secing them here. It is interesting to know, that a thousand telegraph machines ‘for sending photographs over telephone lines are at this moment on order in the United States for the American newspapers, which now publish such pictures as a matter of course, without referring to the fact that they are telegraphed. Already the novelty has gone from this latest triumph of telegraphy.