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), 1833-1928 · New York : T. Audel & Co. · leaf 112
mally against one of these stops by the action of a spring, THE TELEGRAPH 2,205 there being an electromagnet which when energized acts on anarmature attached to the lever causing the latter to move fromthe upper stop to the lower stop. Ques. Why is the instrument called a sounder? Ans. Because, in… … SPRIMGv^ SPRING ADJUSTING SCREW STOPSTANDARD BASE ELECTRO-MAGNETSOFT IRONCORE Ftg. 3,051.—Elementary sounder showing essential parts. Ques. Describe a simple short line circuit. Ans. A simple line having two stations is shown in fig. 3,052. Each station is provided with a key, including a switch,…
Electrical engineering
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