. American quarterly of roentgenology . ulsating current is that thefocus point on the target is more rapidly damaged by aseries of very short and powerful impulses of current thanby the sam£ amount of electrical energy expended in the tubeby a current which is continuous. This has been pointedout by the writer at several meetings of the American Roent-gen Society, and has been fully discussed by Wolter, Rosen-thal, and others. It will be obvious therefore that excitationof the X-ray tube by a powerful continuous current will resultin a gain in speed, and a reduction of the disadvantagesincide
. American quarterly of roentgenology . ulsating current is that thefocus point on the target is more rapidly damaged by aseries of very short and powerful impulses of current thanby the sam£ amount of electrical energy expended in the tubeby a current which is continuous. This has been pointedout by the writer at several meetings of the American Roent-gen Society, and has been fully discussed by Wolter, Rosen-thal, and others. It will be obvious therefore that excitationof the X-ray tube by a powerful continuous current will resultin a gain in speed, and a reduction of the disadvantagesincidental to continuous operation. I have long waited in vain for some manufacturer to bring-out a machine capable of delivering such currents, and sev-eral months ago, I began the construction of a device whichnow gives me practically uniform continuous current of fromten to more than two hundred milliamperes at a potentialsuitable for exciting X-ray tubes. This is accomplished byvalve tube rectification of a polyphase current. The appar-. Fig. 1. Enlargement of photograph of the Gehler folie one second.
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