doubled-down

Updated: May 3, 2025

A hole pierced in this corner of the plate serves to receive a square rod of lead, which connects the plates together and supports one of the poles or contacts of the accumulator. At the point of soldering the doubled-down handle gives a double thickness, and the margins of the plate are folded in such a manner as to insure their solidity.

Various - Scientific American Supplement, No. 598, June 18, 1887