. Radiography, x-ray therapeutics and radium therapy . principle of osmosis. The metals of the platinum group,especially palladium, have the peculiarity that they allow hydrogen to passwhile incandescent. A tube of palladium, closed at one end and open atthe other, is sealed into the neck of the tube. To protect it againstaccidental damage it is covered with a test tube, which can be taken the tube has become too hard, remove the test tube and apply aspirit flame for a few seconds to the palladium tube till it is dark hydrogen contained in the spirit flame penetrates into the
. Radiography, x-ray therapeutics and radium therapy . principle of osmosis. The metals of the platinum group,especially palladium, have the peculiarity that they allow hydrogen to passwhile incandescent. A tube of palladium, closed at one end and open atthe other, is sealed into the neck of the tube. To protect it againstaccidental damage it is covered with a test tube, which can be taken the tube has become too hard, remove the test tube and apply aspirit flame for a few seconds to the palladium tube till it is dark hydrogen contained in the spirit flame penetrates into the inside ofthe tube, and makes the tube softer. The flame must not be broughtnear the point where the metal is sealed with the glass. After the tube has been regenerated time should be allowed for com-plete coohng before it is used again. It is advisable to bring the tube to thedesired degree of softness each time before it is used, and only to heat theextreme end of the palladium tube. The Bauer Air-Valve Regulator.—Another form of regulator is the. Fig. 41.—Bauer air-valve. ( air-valve invented by Mr. Heiaz Bauer. This consists of a delicately-constructed valve, closed by a column of mercury, and fitted with an air METHOD OF USING GUNDELACH REGULATOR 47 filter. By means of a small Kand pump and an india-rubber tube, thecolumn of mercury is depressed so as to open a very small aperture, throughwhich a minute quantity of air is thus allowed to pass. The mercury risesalmost immediately, and the opening is again sealed, the vacuum ofthe tube having meanwhile been lowered by the admission of the air. Ifdesired, the Bauer valve may be worked with a long rubber tube, thusallowing of regulation taking place from a distance, and while the tube isactually running. Gundelach Regulator.—Another very good regeneration apparatus maybe described. This arrangement consists of a little condenser which is made in the formof a cylindrical glass tube covered with an imperfect conducto
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