[Electric engineering.] . that is so made that its secondary voltage may be added to or sub-tracted from that ofthe dynamo. Theoperation of this reg-ulator will be under-stood by referringto Fig. 39. Twocoils A B and CDare wound on a 1am-inated iron coil CD is di-vided into a numberof sections, and con-nections are broughtout to the contactblocks a; h and g are two contact strips in the form of cir-cular arcs, h being connected to one end of the lamp circuitand g to one end of the coil B, which is also connected toone of the primary lines. The other end of the primarycoil is connected
[Electric engineering.] . that is so made that its secondary voltage may be added to or sub-tracted from that ofthe dynamo. Theoperation of this reg-ulator will be under-stood by referringto Fig. 39. Twocoils A B and CDare wound on a 1am-inated iron coil CD is di-vided into a numberof sections, and con-nections are broughtout to the contactblocks a; h and g are two contact strips in the form of cir-cular arcs, h being connected to one end of the lamp circuitand g to one end of the coil B, which is also connected toone of the primary lines. The other end of the primarycoil is connected to the circuit and to the other primarywire, as shown at A. An ammeter is also included in thecircuit to show when the current is at its proper contact pieces e, f make contact between the circulararcs and the coil terminal pieces a, and are so arranged thatwhen a wheel is turned they move towards each other oraway from each other, as the case may be. They are alsoarranged so that they may move past each Fig. 39. § 16 ELECTRIC LIGHTING. 65 Suppose that both c and f rest on the same block in thecenter of the dial; then, the current flows from the linethrough the path l-3-B—g-f-e-k-l-l-l-M-2, and the pres-sure applied to the lamp circuit is the same as that suppliedby the alternator. A current will also flow through A B,because this coil is connected directly across the line, justlike the primary coil of a transformer. This current will setup an alternating magnetism around the iron core and anelectromotive force in the coil CD. If now we connect anyof the turns of C D in series with the lamp circuit, the pres-sure applied to the lamps will be greater or less than thedynamo pressure, depending on whether the E. M. in the part of CD cut in aids or is opposed to theE. M. F. of the dynamo. Suppose the regulating wheel tobe moved so that the contact pieces are in the positionshown; the current will flow through that part of thecoil C D included between
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