THE DISCHARGING ELECTROMETER

FRANKLIN, BENJAMIN (+) TIMOTHY LANE.

Description of an Electrometer Invented by Mr. Lane; with an Account of Some Experiments Made by Him with It: In a Letter to Benjamin Franklin.

London, Lockyer Davis, 1767. 4to. Without wrappers. Extracted from "Philosophical Transactions", vol. 61, part 1. Including title-page and advertisement of volume. A fine copy. Pp. (4), 451-60 + 1 folded engraved plate.

First appearance of Timothy Lane's description of his discharging electrometer. He used it to determine the charge given to a Leyden jar by counting the number of sparks it received from the electrometer set at a constant gap. The instrument became popular in electrotherapy and was used to limit the power of the electrical discharge. (Heilbron, Electricity in the 17th & 18th Centuries).

Order-nr.: 54348