. Radiography and radio-therapeutics . greater the voltage the greater the reverse only means, therefore, of combating the evil is to introduce some devicewhich shall rectify the discharge, eliminate the reverse current whileinterfering with the proper current as little as possible. In order to effect this, many contrivances have been tried, notably asimple spark-gap and various forms of mechanical rectifiers. The mostusual and most efficient method is, however, the valve tube, a vacuum 82 RADIOGRAPHY tube which permits the current to pass unobstructed in the right direction
. Radiography and radio-therapeutics . greater the voltage the greater the reverse only means, therefore, of combating the evil is to introduce some devicewhich shall rectify the discharge, eliminate the reverse current whileinterfering with the proper current as little as possible. In order to effect this, many contrivances have been tried, notably asimple spark-gap and various forms of mechanical rectifiers. The mostusual and most efficient method is, however, the valve tube, a vacuum 82 RADIOGRAPHY tube which permits the current to pass unobstructed in the right directionbut which should suppress absolutely the reverse or making current. Single Valve Tube.—This valve tube, owing to its special construction,is much less inclined to become hard than the simpler types of valve is fitted with the new regenerator so that it can be maintained at a uniformdegree of softness ; this should be maintained at about 16 mm. equivalentspark-gap. When the tube requires regenerating one wire should be con-.
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