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 1133
s thearm back. In the meantime, rock the brushes forward orbackward and keep the sparK about the proper length,say % in., at full load to % in., on short circuit. Gradu-ally the rheostat arm will settle, the spark will become con-stant, and the machine will give its proper current. Thenclamp the… … Fig. 476 care of the machine from the start. By allowing thecontroller to start the machine, a trifle longer spark is ob-tained than by the other method, unless the machine is runfrom the beginning on a very full load. The machine will require a trifle longer spark on lightload, or on bad circuits,…
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-663-364.webp)
