Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1458
ruction 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 1423 rent flows through the crater alternately…
