. American X-ray journal . selecteden accord avec le degré de vacuumoks de notre Crotube. Les fils de connexion reposant sur un support en bois, stand, doivent être recouverts de caoutchouc baquet-ing et aller à la cathode et l'anode du tube de Crooks, ayant pour la réussite excitation de la même comme une clé, le parcage-écart entre les rodsde décharge de la machine, au démarrage. La longueur de l'étincelle dépend tout à fait de la taille de nos tk Leyden Jars, le vide-uum dans le tube Crooks ou l'interrup-ter utilisé sur les tiges de décharge.l'expérience nous apprendra à réguler la longueur d'une étincelle nécessaire pour

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. American X-ray journal . selectedin accordance with the degree of vacuumof our Crooks tube. The connectingwires resting on some wooden support, stand, have to be covered with rubber tub-ing and go to the cathode and anode ofour Crooks tube, having for the success-ful excitation of the same as a key, thespark-gap between the discharging rodsof the machine, when starting. Thelength of spark depends altogether uponthe size of our tk Leyden Jars, the vac-uum in the Crooks tube or the interrup-ter used on the discharging rods.Experience will teach us to regulate thelength of a spark necessary for good( ffects. The jars may he omitted onaccount of a possible explosion, but THE AMERICAN X-RAY JOURNAL. 1039 their action as condensers, if carefullymanipulated, increase our volume ofelectricity, and give us more steady radi-ance. In my laboratory I have used, with comparatively good results, tobring my ten-plate Static Machine inproper motion, the direct current withone-fourth h. p. motor and rheostat witheight buttons.. The glass plates must always be turnedto the left, looking at the machine fromthe front, and the revolutions may varyfrom 300 to 350 and more in x-raywork. To charge the machine we have toplace the discharge rods about half aninch apart. The small arm on the frontright-hand end of the case, if there isseparate charger, should be turned downand the small chain attached to this armshould be hooked over the left-handpole-pieee, so as to connect the smallplates with the large plates ; then 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 whe

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