. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 25. ^) >5f U*#. \ X, ^^n Fig. 26.—The hydrogen tube. 68 DENTAL AND ORAL RADIOGRAPHY of this terminal about three or four inches from the nega-tive terminal of the machine, the current will, when thevacuum of the tube gets high enough to resist its pas-sage, pass over the gap, down the third terminal wireinto the regulating chamber where by heating the as-bestos it will liberate gas and thereby reduce the vacuumof the tube. In addition to the general types of tubes already de-scribed, there are cert
. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 25. ^) >5f U*#. \ X, ^^n Fig. 26.—The hydrogen tube. 68 DENTAL AND ORAL RADIOGRAPHY of this terminal about three or four inches from the nega-tive terminal of the machine, the current will, when thevacuum of the tube gets high enough to resist its pas-sage, pass over the gap, down the third terminal wireinto the regulating chamber where by heating the as-bestos it will liberate gas and thereby reduce the vacuumof the tube. In addition to the general types of tubes already de-scribed, there are certain specialized forms of tubes whichare highly useful, and fast becoming popular. Of these,the hydrogen tube and the Coolidge tube are, byfar, the most important. Hydrogen Tube The hydrogen tube, shown in Fig. 26, 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, which isgr
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