. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Wall Meter or Indicator for Tube ShiftMethod, also Showing Method of Using Adjust-able Double Slider Caliper. pin centering in the perforation of thescreen and having centimeter divisionsclearly marked both ways from the center,making it quite easy to secure an exactnumber of centimeters displacement. There is a considerable advantage inmaking the distance the image is shifted adefinite number of centimeters and meas-uring the tube shift, since the relative errorin measuring the small length of image shiftis
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Wall Meter or Indicator for Tube ShiftMethod, also Showing Method of Using Adjust-able Double Slider Caliper. pin centering in the perforation of thescreen and having centimeter divisionsclearly marked both ways from the center,making it quite easy to secure an exactnumber of centimeters displacement. There is a considerable advantage inmaking the distance the image is shifted adefinite number of centimeters and meas-uring the tube shift, since the relative errorin measuring the small length of image shiftis greater than that in the longer tube shift. When supplied with the accessories in-dicated above, this method becomes as z6 Localization of P^oreign Bodies expeditious as others, and is as accurate asany of the depth methods. The exact de-tails of manipulation are, of course, givenin the regular Army X-Ray Manual. All of the second group of methods re-quire somewhat different manipulation and 0<ferlop. Hinge of Metal Strop Fig. 8. Principle of Profondometer Strip. an added amount of data which may givethe surgeon rather more definite indicationsand assist him materially in many cases. Method D. This method has been de-scribed by Major Joseph M. Flint in TheMilitary Surgeon of March, 1917, and whilethe method is not new in principle it hadnot been generally used heretofore, as ap-paratus for its application was rarely avail-able. It consists essentially in securingthree lines of sight through the body, eachof which is to pass through the points where the rays enter and emergein establishing these lines are plainlymarked on the skin. Two pieces of flexiblemetal, such as a composition of tin, arehinged together in the middle and placedaround the body in the plane of the skinmarks and made to conform to the shape ofthe body. The strip is marked, showing thedistance that one unhinged end overlapsthe other, and the skin marks are trans-ferred to this metal band. Car
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