Handicraft for handy boys; : practical plans for work and play with many ideas for earning money, (1911)
Hall, A. Neely (Albert Neely), b. 1883, Hall, Norman P., ill · Boston, : Lothrop, Lee & Shepard · leaf 296
gap,depending on the size of the coil. Coils are usually ratedaccording to the length of spark they are capable ofgiving. The coil will not operate on a continuous cur-rent, so an hiterrupter is used in connection with theprimary. A I-inch coil costs about $5, and with a good aerial,will send… … Fig. 329. — A Home-made Spark-gap. zincs on the secondary terminals of the spark-coil, asshown in Fig. 328, or a simple frame may be made to A BOYS WIRELESS TELEGRAPH OUTFIT 247 hold the zincs, as shown in Fig. 329. If you make aframe, set in a couple of screw-eyes as shown for set-screws. The…
Woodwork · Toys · Amusements
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