shown in E. Such an arma- While the electric current developed ture as this, mounted with caps, as shown by this machine far exceeded anything in Fig. 14, may then be rotated in a very narrow and dense magnetic field, and its wires will cut many lines of magnetic force in a short time by reason of… … concentrated magnetic field, a very pow- Fig. 16. erful current. This current is then passed through heavy coils of wire sur- being a twenty horse-power engine re- rounding the sides of a large U magnet, quired to drive it. made of massive plates of wrought iron. The important fact developed by Mr.…
Engineering
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