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.

    78/246 (page 52)
    blue, but it did not appear red, and fliort- ened it more; at the third ftroke, it became zig- zagged, many radii were very vifible at the bendings, and continued to fhorten till the eleventh ftroke, when one of the bottles in the fecond row of the battery was ftruck through, the fra&ure was covered over with common cement*, its place fupplied by changing place with one in the third row, fuppoling the mended one to be the weakeft, [fee the introduction to the work] and thus, with the battery in this (late, I made the twelfth ftroke, which feparated the wire, as in Exp. 1, but this wire was fhortened only one inch. * This cement is very cheap and eafily made, as follows: take eight ounces of fpanifh white, heat it very hot in an iron ladle, to evaporate all moifture, and when cool, fift it through a lawn fieve, then add three ounces of pitch, three quarters of an ounce of rofin, half an ounce ofbees-wax, heat them altogether over a gentle fire, till the mixture is pretty hot, frequently ftirring it, for near an hour; then take it oft' the fire, continue the ftirring till it grows cool, and it is fit for ufe.