Meadowcroft, Wm. H. (William Henry), 1853- · New York : The American Technical Book Co · leaf 48
and medium sized coils are largelyused to obtain sparks for gas lighting, for firingfuses and for many other useful and experi-mental purposes. Small coils are also used byphysicians for medical purposes, in which casehandles are connected by flexible wires to theterminals of the secondary and the… … ing of the current passing through the primary.This, in the simple form of coil, is effected bymeans of a vibrating armature which will beseen in Figure 7. It consists of an iron buttonplaced on the end ofa piece of spring steelset in a metallic post.When at rest, thespring touches, ormakes…
X-rays
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