d thickness ofthe iron wire coils, the flow of the current through them may be5, 10, 15 or 20 amperes as desired. 74 THE EONTGEN BAYS IN MEDICAL WORK A red lamp is often fitted to the switch-board to indicate that thecurrent is on through the coils. This is useful in order to preventunnecessary… … Fig. 44.—Plan of Shunt-Circuit Eesistance.M, Mains. S, Switch. L, Pilot-lamp. K, K, Terminals for coil. Figure 45 shows the general appearance of a shunt switch-boardwith two small adjustable series resistances added. One of these isin the coil circuit, the other is for the motor circuit. The motor…
X-rays · Radiography
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