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354 SOUND MOTION PICTURES
modulation, or 5,000 dots a second. This again means 500 to an image, or about twenty-two rows of dots. Even if the image is only an inch square, the definition is rather poor; and if the image size is increased to 1.5 inches square, the definition is correspondingly poorer. Thus we see that the method which makes possible home television as it is to-day, at the same time introduces limitations which make it virtually impossible to transmit large images with the fidelity secured, say, in motion pictures. For the development of television, as the optimistic dreamer sees it, some other very different method must be introduced.
Motion pictures were indeed broadcast through television in January, 1929, by WCFL, the broadcasting station of the Chicago Federation of Labor. Though silhouettes and small objects had previously been broadcast, this was one of the first attempts to put a motion picture on the air. The feat was achieved by a device which passes the film before a beam of light that scanned it from left to right. The light images were then converted into electrical impulses which were amplified and in turn converted into radio-frequency impulses. For the reception of these motion pictures there was used a standard television reproducer consisting of a 48-hole disk revolving at 900 revolutions per minute, scanning from left to right and top to bottom. The output of the receiver included a detector tube, which fed into several stages of a resistance coupled amplifier; and the output in turn fed into a neon tube set behind the disk. A "movie" approximately ij inch high appeared on the receiver's disk.
On February 5, 1929, engineers of the General Electric Company made a very interesting television broadcast over long distance, in which the voice and face of D. W. Griffith, the director, were transmitted from their station WGY, in New York, to Los Angeles. A short wave of