. Manual of static electricity in X-ray and therapeutic uses . ew fast the machine will then be ready fo operate. The chloride of calcium may be rebaked as often as neces-sary, and by using dishes that can be put in the oven withoutinjury the same material can be utilized again and again withvery little waste. I use the same chloride for at least a yearbefore throwing it away and procuring a fresh can. In thewinter time it remains dry and is practically not needed withinthe machine, but I leave it there because it is the safest placeto store it where it can be found. In the spring an
. Manual of static electricity in X-ray and therapeutic uses . ew fast the machine will then be ready fo operate. The chloride of calcium may be rebaked as often as neces-sary, and by using dishes that can be put in the oven withoutinjury the same material can be utilized again and again withvery little waste. I use the same chloride for at least a yearbefore throwing it away and procuring a fresh can. In thewinter time it remains dry and is practically not needed withinthe machine, but I leave it there because it is the safest placeto store it where it can be found. In the spring and fall sea-sons I take it out about once a month and in the worst of dog-days about once a week, but the actual state of the chloride isthe indication for baking it again and not the lapse of any par-ticular time. The next and more important matter to attend to after a newmachine is set up in running order in the office is to providemetallic groundings for both poles, and for the several elec-trodes. Uninstructed operators often drop a chain from the sliding. Grounding to the Water Pipe. AAAA is a stout copper wire passing underthe frame of the machine, through the wall, to the most convenient water pipe, may be either in the same room or in another room. Any water pipe whichcan be reached with a wire from the machine will answer the purpose. C repre-sents the chain dropped from the prime conductor to the floor and hooked over thewire A. D shows the hook in the wall upon which the chain is hung when not in use. J4A 45 STATIC ELECTRICITY. rod to the floor, but the clinical results of such physicians arenot always gratifying. When a current of electricity is con-ducted to earth it should be by a metallic route, and a highpotential difference between the static poles depends upon goodconduction, as well as upon the capacity and power of the ma-chine. Static electricity has no fixed voltage. The operatorcontrols it by his management of the apparatus. Two separate groundings
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