. Popular electricity magazine in plain English. nds for amoving picture play all about the scenerythere are scattered microphones—littletelephone receivers. They are hiddenamong the flowers, on a table near towhich the heroine, say, is speaking. In agarden scene they may be hidden amongthe bushes. Each separate microphone has a radiusof nearly 40 feet, and is so sensitive thatit can easily record and transmit thesound of a match being si nick. The next process the photography oi sound waves by means of light—is a high-ly technical one, but is well known toscientists. It can be summed up, how-
. Popular electricity magazine in plain English. nds for amoving picture play all about the scenerythere are scattered microphones—littletelephone receivers. They are hiddenamong the flowers, on a table near towhich the heroine, say, is speaking. In agarden scene they may be hidden amongthe bushes. Each separate microphone has a radiusof nearly 40 feet, and is so sensitive thatit can easily record and transmit thesound of a match being si nick. The next process the photography oi sound waves by means of light—is a high-ly technical one, but is well known toscientists. It can be summed up, how-ever, in the statement that the shorter orlonger sound waves, can be made to tracevisible waves of ever-varying contour ona moving, sensitive film with which themicrophones are electrically this film will do of recording simultaneously picturesand sounds. A special film, double the width of theordinary film, is used. The left half,when the film is complete, bears theordinary series of instantaneous photo-. Apparatus for Pi Talking Film graphs. On the right half you can see ajagged wave line, each twist oi which re-cords a separate inflection oi sound. The sounds which the film lias caughtare reproduced by the projecting appara-tus about as follows: The rays oi Lightfrom the projector pierce the sound sideof the film, afterwards passing through aSpecial screen, Mr. Laustes own inven-tion. This is composed oi tiny bars of a 1286 POPULAR ELECTRICITY and the WORLDS ADVANCE substance not yet disclosed. These barsare so small that the eye can only justperceive them. The action of the rays onthem is to make them swell to an infin-itesimal degree, so that they touch—ifthe rays are strong enough. When theselittle bars touch an electrical impulse iscommunicated to the sound-reproducingapparatus similar to a telephone receiverand provided with a megaphone. Accord-ing, then, to whether the light rays per-mitted to pass by the jagged line on thesoun
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
