. American X-ray journal . a marked degree to obscure the sub-lying vessels and bones. 70 minutes should not show more clear-ly such large structures as the aorta andthe iliac arteries. They all lie deeply,are covered by vascular structures, andthese simply render the picture verycloudy. The superficial and deep fem-oral arteries are well seen, the internaland external circumflex branches of the 484 THE AMERICAN X-RAY JOURNAL. latter; the obturator lying in relationwith the thyroid foramen and, very faint-ly, the sciatic and comes nervi ischiadi-ci. The girl from whom this illustra-tion was ta
. American X-ray journal . a marked degree to obscure the sub-lying vessels and bones. 70 minutes should not show more clear-ly such large structures as the aorta andthe iliac arteries. They all lie deeply,are covered by vascular structures, andthese simply render the picture verycloudy. The superficial and deep fem-oral arteries are well seen, the internaland external circumflex branches of the 484 THE AMERICAN X-RAY JOURNAL. latter; the obturator lying in relationwith the thyroid foramen and, very faint-ly, the sciatic and comes nervi ischiadi-ci. The girl from whom this illustra-tion was taken had the narrowest pelviswhich I have yet noted ; the distance be-tween the anterior superior spines wasonly cm, while she was a little cases was estimated with regard to thearea to be covered. While writing this paper I have beforeme reproductions of the photographsfrom which are made the illustrationswhich accompany it. These are largerand of course clearer than any half-tonecan be ; it may be, therefore, that my. Lji FIG. II. above medium height and of normalbuild in every other particular. As regards the height at which thetube was elevated above the plate ; thisvaried from 30 cm. in the case of thehands, to 70 cm. in the case of the tho-rax and pelvis. The height in the latter remarks do not apply with exactitude tothe figures in the Journal. To Dr. David Littlejohn, who hascharge of the X-ray Department in theschool with which I am connected, andin which these experiments were carriedout, I have to express my thanks for THE AMERICAN XRAY JOURNAL. 4*5 much valuable assistance; while Mr. LeeHickman, a student, also merits ac-knowledgment for his very careful hand-ling of the plates in development. The Magnetic Deflection of DiffuselyReflected Cathode Ruys. BY ERNEST MEKKITT It is now known that x-rays are devel- are developed at this point as well asRoentgen rays, and are the cause of thebrilliant fluorescence which usually cov-ers about half the glass of such tubes
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