. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 29.—The hydrogen tube. IlIi(iLJlSlTl-:S OF DENTAL X-1LV LABOIIATOUY (J!J Hydrogen Tube The hydrogen tube, shown in Fig. 29, differs from theordinary gas tube in that in addition to having the reduc-ing feature, in common with other tubes, it has the addedadvantage of having a raising device. This means thatthe hydrogen tube may be raised or lowered, at will. Asthe name implies, this tube contains hydrogen, Avhich isgreatly responsible for its unusual flexibility. It is claimed for this tube that it ha
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. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 29.—The hydrogen tube. IlIi(iLJlSlTl-:S OF DENTAL X-1LV LABOIIATOUY (J!J Hydrogen Tube The hydrogen tube, shown in Fig. 29, differs from theordinary gas tube in that in addition to having the reduc-ing feature, in common with other tubes, it has the addedadvantage of having a raising device. This means thatthe hydrogen tube may be raised or lowered, at will. Asthe name implies, this tube contains hydrogen, Avhich isgreatly responsible for its unusual flexibility. It is claimed for this tube that it has a slightly greaterpenetration than other tubes for a given parallel spark. Fig. 30.—The Coolidge x-ray tube. length. The target is made of tungsten, and the cathodeis protected in the same manner as the tubes alreadymentioned. Coolidge Tube The Coolidge tube, shown in Fig. 30, is radically dif-ferent in design from the other tubes already described, and is ditferent in operation, in that it is energized bytwo independent currents, one of high voltage, and theother of low voltage. For this reason, certain auxiliaryapparatus must be used with it, in addition to the x-raygenerator. This auxiliary apparatus consists of a lowvoltage transformer and regulator, and an insulatedstand or shelf for holding the transformer, and an am-meter. The low voltage current serves the purpose of 70 DENTAL AND OEAL EADIOGKAPHY heating electrically a spiral filament of flat, closely woundtungsten wire located within a cylinder on the cathode.This electrically heated filament serves the importantfunction of controlling the milliamperage of the currentpassing through the tube. The