. An elementary manual of radiotelegraphy and radiotelephony for students and operators . keys and control the spark discharges. This control can beeffected from the recei%ing station, which is 60 miles from thetransmitting station. In the same manner the received signalscan be made to operate an Einthoven galvanometer and to photo-graph themselves on sensitive paper tape. 278 RADIOTELEGRAPH Y A view of part of the Carnarvon station buildings, showingthe entrance of the aerial wires, is given in Fig. 24, and a view ofone of the 300 main motor-alternators in Fig. 22. As an example of a sta
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . keys and control the spark discharges. This control can beeffected from the recei%ing station, which is 60 miles from thetransmitting station. In the same manner the received signalscan be made to operate an Einthoven galvanometer and to photo-graph themselves on sensitive paper tape. 278 RADIOTELEGRAPH Y A view of part of the Carnarvon station buildings, showingthe entrance of the aerial wires, is given in Fig. 24, and a view ofone of the 300 main motor-alternators in Fig. 22. As an example of a station combining in one the spark andthe arc methods, we may take that at Cullercoats, on the Nor-thumberland coast, about 8 miles from Newcastle, England,originally erected by the Amalgamated Eadiotelegraphic Company v;-\fe«ife „ - «■■■^^■■>!^(BJ^)i?;,^v«i!^i,;,,,,,,^,,,Mll*■ {Reproduced from Tlie Electrician ly permission of the Proprietors. Fig. 25. but since taken over by the General Post Office and station itself is situated on a promontory running out to comprised a small four-roomed one-storied building and alarge umbrella antenna supported by a single wooden latticetower (see Fig. 25). The mast was built up of bulks of timber6 inches square, jointed in lengths. It is 220 feet high and 2feet square at the base, and supported in a foundation of concreteand stayed by wire ropes cut up into lengths by insulators ofcreosoted wood. The antenna was constructed of bronze wires KA I) 10 TELEGRA PJIIC S TA TIOXS 279 (so« Fij^. 25), which (»xtoiulttl fnmi the top of th» must aiul Kpreadover a circle of 220 feel in diiimeter. It was luado iu two j>art8,each oousisting of 12 wires, and stretched out into a wide semi-circle by guy ix)pes attached to anchors fjistened to varicjus 24 wires of the complete anteuna were connec
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
