y baking it in an oven at a high temperature for some hours—willoften lower an sc-ray tube more or less permanently. Anothermethod of lowering the resistance of a tube which is too highdepends upon the inclusion in a side-tube of a chemical compoundwhich gives off vapour when warmed. When such a… … Fig. 4.—Self-regitlatixg Tube (H. Cox). high tube is the following : A sheath of damp lint or cotton-wool isapplied to the kathodal end of the tube. It should extend alongthe glass to a point level with the surface of the kathode, andshould also touch the leading-in wire. It gives a negative charge…
X-rays · Radiography
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