[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 347
ricity pro-duced by differences of temperature at thejunctions of dissimilar metals. It may even beproduced in the same metal; such as a wirepart of which is straight and the remainder bentinto a spiral, if heated at one end by the flameof a lamp. VACUUM.—A space from which all traces ofresidual… … j ¥1 * 346 ELECTRICITY AND ITS RECENT APPLICATIONS. through the winding, with openings to let theair pass out. The rapid rotary motion of thearmature sends out the current of air, whichkeeps the armature and pole pieces cool andtherefore more effective than the old stylewhich is so liable to heat…
Electricity
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