Residual Charge
If a charged Leyden jar is discharged by shorting the inner and outer coatings and left to sit for a few minutes, the jar will recover some of its previous charge, and a second spark can be obtained from it. Often this can be repeated, and a series of 4 or 5 sparks, decreasing in length can be obtained at intervals. This effect is caused by dielectric absorption.
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—Henry David Thoreau (1817–1862)
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