. American X-ray journal . startthe small plates or Wimhurst machine,by turning the small handle to the right,making several revolutions, until themaximum spark is obtained; then stopthe Wimhurst and immediately start thelarge plates by turning the drivingwheel with or without the motor, to theleft. The chain is then unhooked andthe arm turned up. This explains onemethod of charging, but every make ofmachine has its own special device to dothe same thing. Separate the dischargerods about an inch, and when machineis in action it will be seen that the cur-rent given off the positive pole is whit
. American X-ray journal . startthe small plates or Wimhurst machine,by turning the small handle to the right,making several revolutions, until themaximum spark is obtained; then stopthe Wimhurst and immediately start thelarge plates by turning the drivingwheel with or without the motor, to theleft. The chain is then unhooked andthe arm turned up. This explains onemethod of charging, but every make ofmachine has its own special device to dothe same thing. Separate the dischargerods about an inch, and when machineis in action it will be seen that the cur-rent given off the positive pole is whiterin appearance, and has longer, straight handle to the spark produced. The dis-charge rods should be separated the fulldistance between the pole-pieces if nec-essary. The smallest jars will give thefinest current; the medium jars have totouch the bottom of the same, and theconnections must be properly , the machine should be letalone and the case never opened, exceptwhen necessary to adjust a plate or comb,. or to oil the shaft of the difficulty may be experienced incharging the machine, we may use, inhumid weather, Calcium Chloride—about ten pounds, distributed in dishesin the four corners of the case—butnever allow the Calcium to become fluid,and be careful not to use Chloride ofLime. The case must always be tightlysealed. If a motor is to be used forpower, move the pulley nearer to the L040 THE AMERICAN X-RAY JOURNAL. end of the shaft, so that the belt willclear the case, and run the belt direct tothe motor, which is usually placed onthe floor or a shelf made for the pur-pose. A good Static machine of mod-ern construction, if properly groomedand kept in order, will excite a tubeequal to tlie requirements of generalpractitioners, and its usefulness, thera-peutically, adds additional value. Wehave found that 10 10 plates will gener-ate a sufficiency for all therapeutic and tions which the term implies. By re-peating experiments, research, fac
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