. Röntgen ray diagnosis and therapy . Fig. 15.—Fracture of Lower End of Radius followed by Displacement,taken with a soft tube. grayish-black, but the contrasts are marked and the structureswell outlined. Such tubes are especially fit for the representationof thick bones, and of renal concretions. The fluorescence findsits expression in the deeper shading of the globe. There is exteriordischarge to a lesser degree than in the former variety. Thereforea tube of this degree of vacuum cannot be touched without receiv-ing a shock. The picture from such a tube, which shows the bonystructure, is ill
. Röntgen ray diagnosis and therapy . Fig. 15.—Fracture of Lower End of Radius followed by Displacement,taken with a soft tube. grayish-black, but the contrasts are marked and the structureswell outlined. Such tubes are especially fit for the representationof thick bones, and of renal concretions. The fluorescence findsits expression in the deeper shading of the globe. There is exteriordischarge to a lesser degree than in the former variety. Thereforea tube of this degree of vacuum cannot be touched without receiv-ing a shock. The picture from such a tube, which shows the bonystructure, is illustrated by Fig. 14. 30 THE RONTGEN RAYS A soft tube shows the outlines of the phalanges and the meta-carpus black and the soft tissue dark. There is bright fluorescenceand marked contrast on the screen. But the denser portions of the. Fig. 16.—Paint Indication of Bullet in the Os Magnum and Evidence ofSmall Fragments in the Carpus (Low Vacuum Tubk). (Compare and 18.) bones are not penetrated. Therefore tubes of this kind produceexcellent skiagraphs of the bones of the hand and forearm, but are RONTtiEN TECH XI QUE 31 not powerful enough to represent structural details. A skiagraphtaken with a soft tube is illustrated by Fig. 15. Excessively softtubes produce violet light and show the carpus as black as ink,no contrast being recognisable at all. Tubes of this kind can betouched without receiving a shock. The various degrees were also illustrated by the author in hispublication on Tenontitis and Tenontothecitis. New York Medical Journal, April 27, 1901. How to interpret the different vacua is also illustrated practi-
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