Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 228
are connected to B and B. The base of this detector, or A, A, A, areall connected together and led to the other side of the circuit. The detector can be ad-justed to the highest degree of sensitiveness, and is easy to construct. Make uprightsof one-half inch square brass rod, each one inch high.… … Fig. 3,173.—Peroxide of lead detector. A flat piece of peroxide of lead is clamped betweena platinum surface and a flat piece of lead. Binding posts connect to these two electrodesand are marked + and —. The positive pole of a battery is connected to the platinumelectrode at $e binding pos$ marked…
Electrical engineering
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