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Experimental Researches in Electricity, Volume 1

Michael Faraday

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Book Excerpt: 
. . .cal action; and when thus placed and acted upon by the electric current, will show iodine evolved at p by only half a turn of the machine. With these adjustments and the use of iodide of potassium on paper, chemical action is sometimes a more delicate test of electrical currents than the galvanometer (273.). Such cases occur when the bodies traversed by the current are bad conductors, or when the quantity of electricity evolved or transmitted in a given time is very small.

317. A piece of litmus paper moistened in solution of common salt or sulphate of soda, was quickly reddened at p. A similar piece moistened in muriatic acid was very soon bleached at p. No effects of a similar kind took place at n.

318. A piece of turmeric paper moistened in solution of sulphate of soda was reddened at n by two or three turns of the machine, and in twenty or thirty turns plenty of alkali was there evolved. On turning the paper round, so that the spot came under p, and . . . Read More