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 297
QQQQQ- Battery10 dry cells in series-parallel Receiving Set Transmitting Set Fig. 326. —Complete Wiring Plan — when a Microphone Detector is used. purchased, as they are too complex to make. The out-fit consists of an induction-coil {spark-coil), spark-gap,battery, key, and switch. The…
Woodwork · Toys · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
