United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 160
ign body. Place theends of the other rods on points 1, 2 and 3. (c) Shorten the rods or lengthen them until theystand at the number of mm. found as the difference indistance, from the plate, between each skin marker andthe projectile. (Fig. 7.) The compass is now ready for use. The patient… … Fig. 6. Typical chart for use with the Hirtz compass. 1i J | 1 V Fig. 7. Hirtz compass set ready for application to the patient.153 154 X-RAY MANUAL—U. S. ARMY (Fig. 8). When this condition is fulfilled, the localiz-ing rod (S) is lowered to touch the skin. It now in-dicates the direction in which…
