Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    480/502 page 460
    lower coil, llio-oiul of the lever is r;iiseci, and the iippe. carbon is brought nearer the lower one. The operation i called fecdiii!^ Ihe carbon, aiul shouUl be ;icconi|ilished in :i \ er< gradual manner, otherwise the arc light will not be ste.ady. Art onlin.'iry arc l.'imp with 10 .-unperes p.'issing thrt)ugh the carbon;, .and with 50 volts at disposal gives ,au average light of .ahou <Soo candles. 448. Electric Transmission of Energy.—The dynamo i reversible, that is to say when mechanical energy is supplied tt it electrical energy is produced, .and if connected with a supph of electrical energy the dynamo will act .as .a motor and pro.' duce mechanical energy. Electro-motors .are now employee for m.any purposes, and are convenient since they m.ay be fixer in any position, and require only leading wires to convoy the current, which may be produced by a dyn.amo some miles dis- t.ant. Fig. 157 shows a scries motor, the electro-magnet ami. arm.ature being connecteel so that the current entering at B passes in turn through them and le.aves at .-i. 449. Miscellaneous Uses. The.se include' (i) Electric J? Welding. (2) Electric Ile.ating. (3) Electric winding .and rcgul.ation of clocUs. (4) The use of electric gas lighters.
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