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A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)

Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 538

An illustration from A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments.", 1891, leaf 538 — n reverse the con-nections at p and p, and again note the effect. 401. Electromagnetic Fields and Armatures. —The apparatus just used is an electric motor, with a magneticfield produced and maintained by a permanent magnet, and ELECTROM4GNE TISM. 513 a revolving part, or armature containing no… … Fig. 281. electromagnet to furnish the field, and this is done in alllarge motors. It is less obvious, but equally true, thatthere is a greal advantage in furnishing the armature withan iron core upon which the coil is wound, and this isusually done. These changes give power, and they bring another…

Physics

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