Evening Republican, Volume 21, Number 240, Rensselaer, Jasper County, 12 October 1918 — Electric Pencil. [ARTICLE]

Electric Pencil.

A new electric pencil for marking or writing on any polished steel or iron surface is operated as readily as an ordinary pencil. A stepdown transformer connects it to a lighting socket, and as the point of the pencil is drawn over the steel, the resistance to the passage of the current develops great heat, etching the surface at the point of contact. A rheostat gives control of the depth pf etching.