. Radiography and radio-therapeutics . N« Fig. 66.—Single valve tube. (C. Andrews.). Fio. —Correct metliod of connecting valvetubes in circuit. Fii;. 67.—Triple valve tube. (C. Andrews.) nected to the anode cap (positive), and the other held at a distance ofabout 5 mm. from the cathode cap (negative). As soon as the tube shows awhite foggy light the regeneration is finished. Formerly when it was desired to rectify on higher voltages, or whileusing heavy currents, two or more valves were placed in series ; but a<lifficulty then arose by reason of the fact that such valves did not alwaysi
. Radiography and radio-therapeutics . N« Fig. 66.—Single valve tube. (C. Andrews.). Fio. —Correct metliod of connecting valvetubes in circuit. Fii;. 67.—Triple valve tube. (C. Andrews.) nected to the anode cap (positive), and the other held at a distance ofabout 5 mm. from the cathode cap (negative). As soon as the tube shows awhite foggy light the regeneration is finished. Formerly when it was desired to rectify on higher voltages, or whileusing heavy currents, two or more valves were placed in series ; but a<lifficulty then arose by reason of the fact that such valves did not alwaysincrease in hardness to the same degree, and it was therefore almost im-possible to maintain an efficient rectification, and, at the same time, to passthe full amount of current needed. In order to overcome this trouble a double valve was designed, consisting of two bulbs and sets of electrodes,each exactly similar to one single valve, but joined together in such a manner VALVE TUBES 83 that one vacuum is common to both chambers. The latter are then con-nected in parallel, and
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