American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 403
ernating current of 500 volts. Or where current is notavailable to operate an electric motor, an engine-driven generator is employed. Tis a step-up transformer which transforms the current to 25,000 or 50,000 volts.This latter current charges a condenser c, or Ley den jars (a capacity equal to… … .-•t rt=l- ri=<i JVWVWA a brass disc between two small brass balls is employed, the latter being adjustable^the disc stationary. The balls are supported in a vertical position on corrugated pillarsof ebonite; t is a choking or impedance transformer with a ratio of transformationof unity, that…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-196-79.webp)
