Handicraft for handy boys; practical plans for work and play, with many ideas for earning money (1911)
Hall, A. Neely (Albert Neely), b. 1883- · Boston, Lothrop, Lee & Shepard Co · leaf 288
Sapety-RazobvBlade ^^-i ^ Fig. 311. … Fig. 310. Fig. 310. —A Safety-razor Blade Microphone Detector. (See Fig. 326.)Fig. 311. — How to prepare the Brass Pieces. brass, copper, or tin, and a No. 3 lead-pencil. Thisdetector is shown in Fig. 310. The metal strips should be cut and bent as shownin Fig. 311, and holes should be punched…
Woodwork · Toys · Amusements
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