. The American journal of roentgenology, radium therapy and nuclear medicine . sists of analuminun base at one end of which ismoimted an upright post which carriestwo horizontal arms. The upper arm has at its free end and is adjustable invertical direction only. The ring center isat a fixed distance from the upright second arm is the parallax rod whichis adjustable in two directions, verticaland horizontal. A ball or cone is attachedto the end of this rod. In the center ofthis ball is a wick that can be extendedwhen pressure is made on the plimger atthe opposite end. In the bas
. The American journal of roentgenology, radium therapy and nuclear medicine . sists of analuminun base at one end of which ismoimted an upright post which carriestwo horizontal arms. The upper arm has at its free end and is adjustable invertical direction only. The ring center isat a fixed distance from the upright second arm is the parallax rod whichis adjustable in two directions, verticaland horizontal. A ball or cone is attachedto the end of this rod. In the center ofthis ball is a wick that can be extendedwhen pressure is made on the plimger atthe opposite end. In the base of the instru-ment is moimted a ring of the same sizeas the upper one, but with a finger con-taining a wick which can be pushed intothe center of the ring. These wicks are to beinked with suitable skin ink for the purpose 290 Instrument for Foreign-Body Localization of marking the skin. To the right of theupright post is placed a vertical scale whichis graduated to quarter-centimeters; thisscale indicates the distance from the underside of the upper ring (the skin) to the. Fig. 3. Schematic Drawing of the Blaine ModelParallax Localizer. center of the ball on the parallax rod(level of the projectile), thus giving thedepth, d, from above. The upright postis similarly graduated and gives the dis-tance from the upper side of the lowerring (the skin underneath) to the centerof the parallax ball, thus giving the depth,/ (height from below). A third scale isprovided on the parallax rod which alsois graduated in quarter-centimeters, thisreading giving the lateral distance fromthe tip of the parallel rod ball (skin mark),thus giving the depth, h (lateral), from theside at the level of the projectile. All three scales are direct-reading andno addition, subtraction or other mathe-matical proceeding is required in thistriple localization. To facilitate the proper and accuratejudgment of the shadow displacements ofprojectile and parallax ball, an accessoryguide is found in a rectangular t
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