. The American journal of roentgenology, radium therapy and nuclear medicine . are upright and allows up and down ad-justment. The plane of the semicircle is par-allel to the surface of the block. Projectinginward through round holes cut in each freeend of the semicircle are two rods terminat-ing in small brass balls. These rods are ad-justable and can be fixed by entire semicircle is also adjustable on thesquare upright and can be fixed by a thumb-screw. Lateral rotation of the semicircle is of Read at tlie Midwinter Meeting of the Eastern Section of The American Roentgen Ray
. The American journal of roentgenology, radium therapy and nuclear medicine . are upright and allows up and down ad-justment. The plane of the semicircle is par-allel to the surface of the block. Projectinginward through round holes cut in each freeend of the semicircle are two rods terminat-ing in small brass balls. These rods are ad-justable and can be fixed by entire semicircle is also adjustable on thesquare upright and can be fixed by a thumb-screw. Lateral rotation of the semicircle is of Read at tlie Midwinter Meeting of the Eastern Section of The American Roentgen Ray Society, January 28, 29, 1921. 402 Atlantic City. N. J., Head-Rest for Roentgenography of Sinuses 403 course impossible, as the square hole in thesemicircle fits accurately over the square up-right. The method of operation of this head-restis as follows: The apparatus is placed on a table, or someother level surface, and the patient either liesor sits with the forehead against the surfaceof the block. The metallic semicircle is ad-justed on the square upright until the rods. Fig. I. Head-rest for radiography of the accessorysinuses. with the brass balls come opposite .the exter-nal auditory meatus on each side. The rodsare then adjusted so that the balls are placedin the external auditory meatus on each thumbscrews are tightened and thehead held accurately in this position. Sincethe metallic semicircle is parallel to the sur-face of the plate, which in turn has beenplaced on the surface of the wooden block,the distance from the plate to the brass ballon each side will be the same. As the brassball has been placed in the external auditorymeatus, therefore the distance from each ex- ternal auditory meatus to the plate will bethe same, and if this condition obtains, thehead will not be rotated from side to side. A small right-angled triangle of celluloid oraluminum is fastened between the small brassball and the rod on one side by passing therod through a hole drilled in
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