. American quarterly of roentgenology . ). the light, there is noted the position occupied, by the shadowof the foreign body with respect to the vertical lines of C andD. A reading is made of the line or lines, which passthrough the body, and this is transferred to the correspondinglines of the C or D scale of the chart, to the right or leftside, depending on which eye is under examination; Withoutremoving the plate the E reading is similarly made and trans-ferred to the chart. To take the A or B reading the plateis shifted slightly until the image of the indicating ball on thesecond exposure
. American quarterly of roentgenology . ). the light, there is noted the position occupied, by the shadowof the foreign body with respect to the vertical lines of C andD. A reading is made of the line or lines, which passthrough the body, and this is transferred to the correspondinglines of the C or D scale of the chart, to the right or leftside, depending on which eye is under examination; Withoutremoving the plate the E reading is similarly made and trans-ferred to the chart. To take the A or B reading the plateis shifted slightly until the image of the indicating ball on thesecond exposure coincides with the Right or Left ball ofthe vertical coordinates A or B. The line or lines of theA or B coordinates which cross the shadow of the body arenoted and indicated on the A or B lines of the chart. The American Quarterly of Roentgenology . horizontal coordinate E should he the same in both readii \If the foeus point on the anode of the tuhe was accurately setby the cross-lines on the lead-glass shield of the tubeholder, the. Fig-. 6.—Radiograph of foreigri body in eye (three-fourths actual size). images of the indicating ball on the plate will coincide simul-taneously with those on the transparent key plate, and it willthen not be necessary to reset the plate to read the position ofthe A and B coordinates. After the three readings have been transferred to the chart,the point of crossing of the A or B and the C or Dlines is ifound, which gives the location of the foreign body inreference to the front view of the eyeball, indicating its situationabove or below the center of the cornea and to the nasal ortemporal side of the vertical plane. Where a vertical line fromthis point crosses the E reading on the horizontal section ofthe globe it gives the depth of the body in the eyeball or bodies of large size both ends should be localized to give theposition in which the ibody rests in the globe. The situation ofthe body on the side view is determined by transferri
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