Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 435
g combines the CHAP. XII.] ELECTRICITY AND iMAGNETISM. 409 duplex and the dipTex methods. On one and the sameline are used two sets of instruments, one of which(worked by a **polarised relay) woiks only when thedirection of the current is changed, the other of which(worked by a non-polarised relay…
Electricity · Magnetism
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