Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1458
uction ofarmatures. These laminated cores, and other parts formingthe magnetic circuit in the arc lamp are necessary to avoideddy currents. The crater has neither a cup shape on theupper carbon, nor a point on the lower carbon, because cur- Arc Lamps 14213 rent flows through the crater alternately…
