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 287
works well. The Silicon Detector is undoubtedly the best, andwhen the silicon has been obtained, it can be madevery quickly. Silicon is not expensive, a generous-sized lump usually being sold for 25 cents. Figure 312shows a simple form of this detector. The silicon should be held to a base block by… … NJING-COIU Si_iotR; Also toSwITCh. Fig. 312 Fig. 312.—A Home-made Silicon De-tector. (See Fig. 325.) Fig. 313. — Strip of Brass with whichSilicon is held to Binding-post. Fig. 314. — Bend a Piece of Wire likethis and connect as shown in Fig. 312. be bent as shown in Fig. 314 and be secured at…
Woodwork · Toys · Amusements
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