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 287
ment can be found. In no caseshould the weight be heavy, for if it is, the detectorwill not operate at all. If you bend the needle slightly,it will be easier to keep it in position. The propermethod of connecting the detector to the other instru-ments is shown in Figs. 307 and 326. A Razor Blade… … 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
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
