upter. Such amanoeuvre is usually necessary withsynchronous motors, as they aregenerally unable to start from rest,and must be artificially assisted toreach their proper speed, thoughwhen once in step they maintain aconstant rate even under tryingvariations of their load. Another method of adapting… … Fig. 46.—Turbine Break,Synchronous Motor. 78 THE RONTGEN RAYS IN MEDICAL WORK this appliance is pulsatory rather than continuous, it has been ofgreat value in the solution of the problem of the use of the alternat-ing mains. A Pollak or a Nodon valve rectifier may be used as asource of current for…
X-rays · Radiography
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