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The Leyden Jar

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-333

2025-11-30

442

is a convenient form of condenser.  It consists of a glass jar with a wooden stopper, through which passes a brass rod terminating outside in a metal ball and inside in a chain touching the inner coating of the jar. The jar is coated both inside and outside, to about two thirds its height, with tin foil pasted on the glass. The jar should be made of thin glass, to give it greater capacity, but if the glass is too thin, it is liable to be pierced by a heavy charge.

The Leyden jar is charged by holding it in the hand, or in some other way connecting the outer coating with the earth, and presenting the ball, connected with the inner coating, to the source of electricity. It is discharged by touching the outside coating with one end of a discharger and bringing the other end near the knob of the jar, when the discharge will take place in the form of a heavy spark, as in Fig. 1. The outer coating should be touched by the discharger first, or the heavy spark will tear off the tinfoil coating.