Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 179
more suitable for the transmission of themusical notes, which were reproduced by the Edisoninstrument with the greatest clearness, and so loudly as tobe heard in every part of the lecture-hall. The voice ofthe speaker at the Brighton exchange was also very clearlyreproduced; and although the… … Fig. 52- Fig- il- Smith discovered that when selenium was exposed to lightits electrical resistance varied with the intensity of thelight falling upon it, and shortly afterwards Professor W.G. Adams found that a ray of hght falling upon a bar ofselenium produced an E.M.F., causing the selenium…
Electric industries · Electricity
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