. X-ray manual : Army . not make1801 or 1799. Since the rectifier for a 60 cycle currentmust make a quarter-turn each l/120th of a second,the motor must turn at 1800 It must be ob-served that such a motor is designed for a given fre-quency and cannot be expected to work on one greatlydifferent from that intended. Starting. Many motors require connection to a special startingdevice in order to bring them up nearly to the requiredspeed before making the running connection. Do notdelay too long, and do not throw over the switch tooquickly. A little practice will enable you to tell byt
. X-ray manual : Army . not make1801 or 1799. Since the rectifier for a 60 cycle currentmust make a quarter-turn each l/120th of a second,the motor must turn at 1800 It must be ob-served that such a motor is designed for a given fre-quency and cannot be expected to work on one greatlydifferent from that intended. Starting. Many motors require connection to a special startingdevice in order to bring them up nearly to the requiredspeed before making the running connection. Do notdelay too long, and do not throw over the switch tooquickly. A little practice will enable you to tell bythe sound of the machine when the speed is about right. Oil. Do not expect a machine to run for long periods with-out lubrication. Follow the makers instructions, if anyare given. Do not use too light an oil. An oil like 3 in 1is good for sewing machines but must not be used onpower motors. Use real machine oil. Protection. It is well to have the field and the armature of anX-ray motor protected from small sparks due to tran-. 10 20 30 40 50 60 70 80 fO 100 Fig. 28. Relation of X-ray production on two types of control. AC,heostat voltage current line. Voltage ordinates at the left. DE, correspondingK-radiation, quantity ordinates at the right. AB auto transformer chartIne. DF., corresponding quantity line. Quantity In arbitrary units. Main C3 i ;r
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