The Radio Boys on the Mexican Border by Gerald Breckenridge
page 7 of 236 (02%)
page 7 of 236 (02%)
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writing pad will do.
[Illustration: Figure 1] First, draw the circle out with a compass to the diameter shown and then divide off the outside into an unequal number of divisions as shown. Draw a light pencil line through each of these marks to the centre of the circle. Now with your scissors cut out the disc, after which you cut the slots as shown. The slots should be about one-quarter of an inch in width and of the depth shown in the drawing. Two such discs should be made and, when all cut out, should be given several coats of shellac to add stiffness and to improve the insulating qualities. Now at your hardware dealer's buy one-quarter pound of No. 24 double, cotton-covered wire and proceed to wind the coils in the manner shown. Keep the windings even and avoid all joints throughout the length of winding. When you have finished, mount the coils as shown in the drawing. Make sure that the windings on both coils run in the same direction. If you fail to do this, the set will not work. For the detector, it is better to purchase a good make of galena detector at any radio supply store. If you are handy with tools, however, you can buy the galena and make your own detector. It will work with more or less satisfaction. Your next need will be the condenser. The condenser consists of a |
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