. Archives of physical medicine and rehabilitation . scale is now init the Sweetbriar Laboratories and pro- piogress in order to meet the demand. Acme Magnetic Sphere Gap nrHE perfecting of the Acme Mag-netic Sphere Gap by the AcmeX-ray Company of Chicago, has justrecently been announced. 1 h^s gap issomething entirely different from theordinary sphere gap and will no doubtattract much attention among those in-terested in roentgen work. It is verysimple to operate and eliminates allpersonal error. When the potential across the x-raytube is to be measured, a cord is pulledwhich causes one spher
. Archives of physical medicine and rehabilitation . scale is now init the Sweetbriar Laboratories and pro- piogress in order to meet the demand. Acme Magnetic Sphere Gap nrHE perfecting of the Acme Mag-netic Sphere Gap by the AcmeX-ray Company of Chicago, has justrecently been announced. 1 h^s gap issomething entirely different from theordinary sphere gap and will no doubtattract much attention among those in-terested in roentgen work. It is verysimple to operate and eliminates allpersonal error. When the potential across the x-raytube is to be measured, a cord is pulledwhich causes one sphere to move slowly the indicator will retain its position aslong as tlic cord is not released. As<|uickly as the cord is released, the balland indicator both return to theiroriginal positions. The scale has large black figures ona white background and is easily readat a considerable distance. It is cali-brated in kilovolts (crest or peakvalues) in accordance with the presentpractice. The gao is arranged for use with thenew Acme 85 kv. Corona Proof. toward the olhei. 1 raction is kept onthis cord until a spark passes betweenthe spheres. However, it is not neces-sary to read the gap at the exact in-stant the initial spark passes, as thisgap is provided with a magneticallycontrolled indicator which is celeasedwhen the spark first passes and indicateson the scale the point at which this oc-curs. If one keeps pulling the cord thescale will continue to move, but theindicator will move with it and stil!show the original reading. One can,therefore, read the gap at leisure, as Roentgen Generator ( 120 kv. peakvalue) equivalent to seven and one-half inches, oi for use on a circuit ofI 70 kv. (peak value) equivalentto twelve inches. It can be mountedeither on the transformer cabinet or-inthe overhead system. This gap fills a very important placebecause it combines the conveniencenecessary for fast routine work withthe accuracy which is so essential a therapeutic and diagnosti
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Keywords: ., bookcentury1900, bookdecade1920, bookidn08archiveso, bookyear1920
