. Radiography, X-ray therapeutics and radium therapy . Fig. 46.—French valve. (C. Andrews.) Fig. 47.—Oliver Lodge valve tube. (Cossar.) tube surrounding this is of much smaller diameter than in the other action of this valve is very perfect, complete rectification being obtainedwithout any appreciable loss of current. The French pattern is, however,rather more delicate than the others, and also tends to go up in vacuumrather quickly. The provision of an osmosis regulator permits, however,of the latter trouble being overcome. The Oliver Lodge valve tube is often used. It has the disad
. Radiography, X-ray therapeutics and radium therapy . Fig. 46.—French valve. (C. Andrews.) Fig. 47.—Oliver Lodge valve tube. (Cossar.) tube surrounding this is of much smaller diameter than in the other action of this valve is very perfect, complete rectification being obtainedwithout any appreciable loss of current. The French pattern is, however,rather more delicate than the others, and also tends to go up in vacuumrather quickly. The provision of an osmosis regulator permits, however,of the latter trouble being overcome. The Oliver Lodge valve tube is often used. It has the disadvantage thatit cannot be regulated, but it is claimed for it that it does not require regula-tion. This claim is open to question. When it is necessary to check thereverse current which is found when very heavy discharges pass througha tube a number of these valve tubes may be placed in the circuit. Regulation of the Valve Tubes.—The regulation of valve tubes iseffected in a similar way to that of X-ray tubes, according to the type of regu-lato
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