File:American X-ray journal (1899) (14570171119).jpg

Identifier: americanxrayjour5618unse (find matches)
Title: American X-ray journal
Year: 1900 (1900s)
Authors:
Subjects: X-Rays Radiography
Publisher: St. Louis : American X-Ray Publishing Co.
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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quickly dimin- only temporarily restored, for water va-por cannot take the place of hydrogenwhich has been used up. To overcomethis difficulty the experimenter namedinvented the intermolecular regulator,which allows hydrogen to be introducedfrom the outside through metal tubingforming part of the walls. The definition of a tube depends uponthe impact area on the target being as 690 THE AMERICAN X-RAY JOURNAL- small as possible. To produce this re-sult the target must not be placed at thecentre of curvature of the cathode, as di-rected by previous experimenters, but al-ways beyond this, as was first done byFrei. Dr. Rollins has shown that thedistance varies with the charge on theparticles—the greater their mutual repul-sion, the further the focus will be fromthe cathode. When the force of a pow-erful generator is concentrated on asmall area of the target, this is quicklymelted. To avoid this he has made thetarget hollow and cooled it. A more de-tailed account of x-light phenomena may
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FIG. 2.— COPPER VANE FOR COOLING TAR-GET OF A-W-L TUBE. be found in a series of notes by him inthe Electrical Review during the lasttwo years and in his papers in this jour-nal. big. i represents on a scale of one-fourth the original A-W-L-tube whichMr. (Jelling has made in its presentform for over two years. The target isa hollow tube of seamless platinumdrawn by Baker & Co. For moderategenerators it is sufficient to cool the tai- get with the copper vanes shown in Fig.2. For more powerful ones a rotary aircompressor is furnished. For the mostpowerful apparatus it is necessary to coolthe target by discharging a stream ofwater against the back of it, the wasteescaping through the outer tube to anyconvenient receptacle. Trowbridge,Tesla, Edison and Williams cooled thedischarge tube soon after Roentgen dis-covered that some of Lenards rayswould penetrate the human body, butthis was the first tube in which a hollowtarget was cooled to prevent it frommelting, and though it has been

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