American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 121
d as outlined in Fig. 75, the platesof the respective series being connected. In that figure the horizontal lines representthe alternate sheets of tin-foil; the blank spaces, the insulating material. The practical unit of electro static capacity is the microfarad (the one-millionthpart of a farad.)… … THEORY OF ADJUSTABLE COXDEXSER, In practice it is frequently necessary to be able to vary the capacity of a con-denser. To permit this, adjustable condensers are so constructed that, by theinsertion or removal of metallic plugs, more or less plates of tin-foil are brought intoor cut out of service.…
Telegraph
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