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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    fcrews to fet the Eleclrometer upright withal. D, is a folid piece of glafs, of any length and fize, fufficient to fupport and infulate the in- ftrument, wherever it is to be placed: the . length of that here delcribed is about nine inches and a half between the fockets in which it is fixed, and its upper end is feen in the focket, or cap M, fig. 1. The arms G 1, and G 2, and the balls I 1, and / 2, fig. 1, are all made hollow, of thin copper, that they may be as light as polfible. The arms G 1, and g, with the ball F, turn round on the large bent wire H; and when in ufe they are put nearly at a right angle with G 2, and H', being all turned to the off fide, fo as to be, as much as polfible, out of each other's atmofpheres, or the atmofphere of a jar, battery, prime conduftor, or the like. At K, is reprefented a kind of face, or dial plate, with an index; this index is carried once round by the motion of the arm G 2, with its ball / 2, moving through a quarter, or ninety degrees of a circle; the motion is given to the arm and its ball, by the repulfive power of the B 2 charge
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