An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 124
to an iron base so as to make a horse-shoe electromagnet. The armature is shown at the top ofthe figure, above the magnet. When a current flows in the magnet winding, the armatureis attracted and the bar drawn against the lower stop. Asthe bar moves back and forth it makes a sharp click whenever… … Adjusting Screws^Contact, Fig. 58. Electromagnet - Telegraph sounder.
Electricity · Magnetism
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