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 40
ay magnet when it is energized and serveto make contact with inner springs. The retardation coils each consist of two windingsof cotton covered wire wound on one core. THE TELEPHONE 2,133 Ques. What is the advantage of this arrangement? Ans. It enables each operator to make any desired con-nection… … Fig. 2,938.—Circuits of the original P- B. X. switchboard are shown for four station jacks andfive trunk jacks. The fifth trunk jack representing a private line is shown separated fromthe others so that the simpler form of the circuit may be plainly seen. The locknut switch-board connections are…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-510-268.webp)
