Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 42
tanding thecoercive power of steel, theyslowly part with their magnet-ism. But when an armatureis used, the opposite poles of the magnetand armature being in contact with oneanother, i. e., N with S, they serve to bindone anothers magnetism. Thin bars of steel can be more thoroughlymagnetized than… … 40 TELEGRAPHY. is called a compound magnet. In any mag-net the outer layers are far more stronglymagnetized than the central ones; so a steeltube makes very nearly as strong a magnetas a rod of the same diameter, and is muchlighter than the latter. CHAPTER VI. THERMO-ELECTRICITY. So far in our…
Telegraph
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