Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 73
ralizing cir-cuit which united two metal combs with pointed spikes,situated in front of the rotating front disk, opposite thetwo field-plates. There was (at first) no diagonal con-ductor. It will be noted that while the combs, whichserved both as neutralizing and collecting combs, were infront of… … Fig. 41. 66 ELECTRICITY AND MAGNETISM part i was used: first the two discharging knobs were puttogether, then the front disk was set into rapid rotation.While so rotating a small initial charge was communi-cated to one of the field-plates by holding to it a rubbedpiece of ebonite or glass, or by…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-795-426.webp)
