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TELEVISION 35i
cost. One may now construct a set that will bring in pictures, if it is properly tuned to and synchronized with the transmitting station that happens to be broadcasting pictures at the time. Though the images are not good enough for regular reception, moving figures and faces are faintly recognizable. Amateurs, in fact, were successful in bringing about interesting receptions during the past year over distances of five hundred miles or less. Pictures were received regularly during that period, and interference occurred only in thunderstorms during a few of the evenings when tests were scheduled. At times, furthermore, when ordinary radio signals were very weak and the static was so bad that the voice announcements could not be understood, perfectly recognizable images were picked up by television sets.
The system that shows immediate promise for the home constructor is that which is known as the " scanning disk." This disk, which is sometimes called after its inventor, Nipkow, who patented it in 1884, makes possible the decomposing of an image into a large number of small images for the purpose of transmission. A number of holes are drilled near the outer surface in a spiral. The number of holes in the disk determines the number of vertical or transverse divisions in the picture. To secure the best clarity or definition with a given number of small images, or "dots," as we call them, the width of each dot should equal its height. This makes it advisable to have a square image. Since the number of holes in the disk determines the number of dots in one direction, and since the picture is to be square, it follows that the total number of dots is equal to the square of the number of disk holes. If, for example, the disk has forty-eight holes, then the image will be decomposed into forty-eight times forty-eight, or 2,304 dots at the transmitting end. The receiving process recomposes these 2,304 dots of differ