Abstract
MR. A. W. PORTER gave in NATURE of March 31 (vol. lxxxiii., p. 142) an account of his experiments on electric discharges over photographic plates, made in order to ascertain what is due to the luminosity of the discharge and what to the discharge itself. Knowing that the disruptive discharge carries metallic particles from the electrodes, and that in the silvering of mirrors by the wet processes the silver begins to set at every metallic particle which clings to the surface of the glass because of the action of local couples, I ventured to develop the invisible image of the discharge on a clean glass plate by the silvering solution.
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