Abstract

A brief account is given of the physical limitations which influence the power output of stationary and rotating anode x-ray tubes used in crystallographic work. Brief mention is made of various tubes which incorporate rotating vacuum seals in the anode assembly. An account is then given of the Peristron dagger, a continuously water-cooled rotating anode x-ray tube which completely dispenses with the need of rotating vacuum seals. Incorporated in the tube is a novel type of cathode assembly which permits of rapid adjustment to the focus from outside the vacuum envelope.

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