Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 367
cts B, and breaks the circuit indoing so. B continues rapidly vibrating backwards andforwards. The opposed surfaces must be of platinum, as anyother metal is rapidly oxidised, and the oxide acts as anon-conductor to the current. 348 Electricity. [Book III. The Condenser (Fig. 228).—This is made of… … Fig. 228. base of the instrument. The object of it is to reduce thedirect extra spark in the primary coil induced by makingand breaking contact. Without a condenser we have a brightspark between the screw and stud each time contact is broken,which, by prolonging the current, increases the time…
Electricity
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