. X-ray manual : Army . w move pointer (A)(attached to screen) along the scale on the screen untilit marks the shadow. The focus is now moved anyconvenient distance and pointer (B) is moved to markthe new position of the shadow. Pointer (C) is now setat the same distance from (B) that (B) is from (A).The screen is raised until the shadow is shifted to (C).At this point read on the scale of the upright the dis-tance that the screen has been raised above the equals the distance of the foreign body below thescreen in the line of the vertical ray previously the screen di
. X-ray manual : Army . w move pointer (A)(attached to screen) along the scale on the screen untilit marks the shadow. The focus is now moved anyconvenient distance and pointer (B) is moved to markthe new position of the shadow. Pointer (C) is now setat the same distance from (B) that (B) is from (A).The screen is raised until the shadow is shifted to (C).At this point read on the scale of the upright the dis-tance that the screen has been raised above the equals the distance of the foreign body below thescreen in the line of the vertical ray previously the screen did not rest on the skin at this point thedistance between them must be subtracted from thereading. Equal Shadow-shift. Jordans Method11 is based upon the fact that,given a surface (s) an object (o) and a distant light i(L) movable in a plane parallel to (s):—then, theshadow of (o) will move proportional to its distancefrom (s) or inversely as its distance from (L). Inthe diagram (Fig. 13) let A, B, and C represent three I %. Fig. 10. Harets method. Diagram to show movement of shadow with two po-sitions of tube.
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