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.

    26/246 (page 4)
    charge of ajar, See. between the two balls I 2, and L. The ends of the index, from the center, are of different lengths; the longed end reaches to a graduated circle, divided into ninety equal parts, anfwering to the ninety degrees, which the arm G 2 moves through: the fhorteft end reaches to a Tmaller circle, which may be divided into any number of equal parts anfwering to the divifions on the arm G 1, with its Hiding weight n, each of which, is equal to one grain, and the whole face is covered with a watch glafs*, to prevent the eledfricity from flying off', or efcaping at the points. The upper end of the glafs-fupporter D, is cemented into the brafs cap, or focket Al, fig. 1. This cap enters the ball L, at the bottom of it, and is ferewed into its upper part at a. The top part of the cap M, is tapered off to * There was an Ele&rometer conftru<fted by a very ingenious Gentleman fome years ago, the face of which was covered with a glafs: but it feemed to me to be lefs ufeful than Henley’s Eleftro- meter, though much more complex] yet its neatnefs was very pleafing. a