Practical electricity, with questions and answers (1901)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 218
apart. Figs. 69 and 70 are diagrams tha^ illustrate the actionof the series lamp and the modern constant potential lamp. In the series lamp, in which the strength of the currentis constant, the strength of the magnet is varied by usinga series coil and a shunt Coil in opposiition to it. The… … Figure 70Diagram showing action of constant potential arc lamp. QUESTIONS ON CHAPTER XVII, 1. How is the light produced in an incandescent lamp? 2. Why is a vacuum necessary in the bulb of an incan-descent lamp? 3. Whj^ is it necessary -to use so expensive a metal asplatinum to carry the current to…
Electricity · Electric generators
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