Miscellaneous experiments and remarks on electricity, the air-pump, and the barometer : with the description of an electrometer of a new construction ... / by A. Brook, of Norwich.

  • Brook, Abraham
Date:
1797
Catalogue details

Licence: Public Domain Mark

Credit: Miscellaneous experiments and remarks on electricity, the air-pump, and the barometer : with the description of an electrometer of a new construction ... / by A. Brook, of Norwich. Source: Wellcome Collection.

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    * put as many grains into the other fcale, as will juft raife the fcale with the ball I i, in it; then mark the arm at the fame end of the weight n, and divide the fpace between the two marks, into as many equal parts as there are grains in the fcale; each part will then be equal to one grain: each part may alfo be divided and fubdivided into halves and quarters. The arm G 2, fig. 1, being repelled, fhews when the charge is increafmg, &c. and the arm / 1, with its weight n, tells what fuch repul five power is between two balls of the fize of thefe, in grains, according to the number of divifions, at which the weight n, on the arm G 1, refts, when it is lifted up. The weight??, by repeated trials, having been put at different places, fuch refpebfive number of grains may then be marked on the leffer circle on the dial-plate, to which the fhorteft end of the index K, fig. 1, reaches, and where it points at*: fo * The Gentleman who invented the Electrometer, mentioned in the foregoing note, conftru&ed it fo that the index was carried twice
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