Mowat, Harold, 1883- · London : H. Frowde · leaf 38
nce of theelectromotive force between the two ends of a lengthof a single spiral coil will be one-sixteenth of 200volts, and between each stud one-eighth of 200volts. Thus if the arm is in contact with the studmarked 1, the fall of potential is 12-5, and 187-5volts go to the induction coil. If the… … Fig. 6. Rheostat. Eight brass studs are connected to the lower end of the coils, eight innumber, and contact can be made with any of these by turning a handle,and the current led o£E through it to the induction coil. described later when the accessory apparatus isconsidered. The energy expended on…
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