Page 411 | Volume 2 | Chapter 25 | Auxiliary Apparatus
Ques. How is this remedied to some extent?
Ans. The contact pieces are so shaped that they open along their whole length at the same time, so as to prevent the concentration of the arc at the last point of contact. This feature is clearly shown in fig. 461.
Ques. For what service are "snap" switches suitable?
Ans. They are used on circuits containing lamps in comparative1y small groups, and other light duty service.
When first published in 1914, these books were intended to explain the scientific principles of electricity (which at the time was a new and exciting technology) with "the aid of a very large number of illustrations, together with specific explanations, worded in concise and simple language".
What really makes this collection of books special today is the detailed documentation of most of the earliest inventions in electrical history including telegraphs, motors, switchboards, and high power distribution systems.
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