Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 79
he fuses be not desired, the arm maybe shortened. Provision is made for fitting insulator pins to the top of the arms, whenthe switch is mounted vertically, which will hold insulators at right angles to the switch,making it possible to end a line on the top of these arms and then drop down… … Pig. 2.217.—Horn break sv.itch. In operation, the arc formed at break, will travel towardthe extremities of the horns because of the fact that a circuit will tend to move so as toembrace the largest possible number of lines of force set up by it. Hence, the arc thatstarts between the horns where…
Electrical engineering
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