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.

    70/246 (page 44)
    through, nearly in the thinned, but never in the thickeft place, which {hews the neceffity of fubdance in the glafs. [See introdu£lion to the work.] EXPERIMENT XXXIII. As in Exp. 19, and 21, where the former is but half the quantity of coated furface of the latter, charged to thirty, and the latter to lif- teen grains, to know how high forty-eight feet of coating muff be charged to produce the fame effe<d exactly: and as the quantity of coating in four bottles, confiding of a little more than fix feet and a half, is contained in forty-eight feet a little more than feven times; fo I tried by charging forty-eight feet only to a little more than four grains, or only about one feventh part fo high, as four times feven is twenty-eight, that is, but two lefs than thirty, and this had exactly the fame effedt on the wire, which was one hundred and feventieth of an inch thick, and three inches long, as the former.