Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 179
Hows. Question 8. What is an electro-magnet? Answer. An electro-magnet consists of a coil of wire, 180 elementary electricity a piece of soft iron to fill the hollow of the coil and acurrent to pass through the wire. Fig. 93 shows this, as well as the lines of magneticaction. Question g. What are… … Fig. 93. An Electro-Magnet with its Magnetic Field. (4) A core placed in a solenoid makes it anelectro-magnet. Remember plugs of brass, fiber or other materialsplaced in a solenoid are not cores in the technical senseof the word. (5) The helix or coil is usually not wound onthe core but on a spool…
Electricity
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-212-105.webp)
