Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1452
tion ofarmatures. These laminated cores, and other parts formingthe magnetic circuit in the arc lamp are necessary to avoideddy currlents. The crater has neither a cup shape on the *upper carbon, nor a point on the lower carbon, because cur- Arc Lamps 1423 rent flows through the crater alternately…
