. The principles and practice of roentgenological technique . B. Electrode. The tube is made harder by: (1) Drawing the electrodes closer to each other. (2) Diminishing the size of the cathode. (3) By withdrawing the cathode terminal into the neck of the tube. (4) By diminishing the sjjace between the cathode and the Fig. 99.—A^ery low vacuum tube. Note the absenceof sharph marked zones, the clearly definedcathode stream and a track of fluorescence inthe active hemisphere due to the fluorescence ofthe slowly moving electrons. C. Regulator. A tube in which hydrogen gas is used as areduc
. The principles and practice of roentgenological technique . B. Electrode. The tube is made harder by: (1) Drawing the electrodes closer to each other. (2) Diminishing the size of the cathode. (3) By withdrawing the cathode terminal into the neck of the tube. (4) By diminishing the sjjace between the cathode and the Fig. 99.—A^ery low vacuum tube. Note the absenceof sharph marked zones, the clearly definedcathode stream and a track of fluorescence inthe active hemisphere due to the fluorescence ofthe slowly moving electrons. C. Regulator. A tube in which hydrogen gas is used as areducing means is harder than one inwhich air is used for reducing. 2. By increasing the current densitythrough the tube. Fig. 98.—Fine focus medium vacuum tube. Notethe intense glow behind the target. The cathodestream is
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
