A treatise on electricity wherein its various phoenomena are accounted for, and the cause of the attraction and gravitation of solids, assigned : To which is added, a short account, how the electrical effluvia act upon the animal frame, and in what disorders the same may probably be applied with success, and in what not / By Francis Penrose.

  • Penrose, Francis, 1718-1798.
Date:
1752
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on electricity wherein its various phoenomena are accounted for, and the cause of the attraction and gravitation of solids, assigned : To which is added, a short account, how the electrical effluvia act upon the animal frame, and in what disorders the same may probably be applied with success, and in what not / By Francis Penrose. Source: Wellcome Collection.

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    [ 3* ] “ For, fays he, having obferved (in eledtrici- “ ty) that light bodies, placed near any part of u the rubbed cylinder, feemed to be equally at- <c trailed, I contrived a femicircle of wire, which 411 could fatten at a conftant diftance, making it <c encompafs the upper femi-cylindrical furface cc of the glafs, at 4 or 5 inches diftance. This cc wire had feveral pieces of woollen threads faf- cc tened to it at pretty near equal diftance s. The cc length of them was fuch, that being extended £C in a diredlion towards the center of that imagi- £C nary circle, on the furface of the glafs, in the cc plane of which the wire was placed; they cc would then reach within an inch of the cir- £C cumference of that circle : but if left to their own liberty, they hung in that parallel pofi- (c tion reprefented, fig. 1. The cylinder was J & 3 fC placed with its axis parallel to the horizon; 4C and in this pofture, it was turned fwiftly <c round