. X-ray manual : Army . Fig. 12. Carvers Fig. 13. To show how movement of shadows varies wit h distance from screen162 [& */ ~PoSiriojr focus at n ) T -6 $irto«,F0lV$AT^ ^ Fig. 14. Jordans method. Appearance of image for two positions of the tubewhen rods and foreign body are at different levels. ( posjrjMjrocus *t f^ \ 73 JL (/ST TotiTfOJf, Focus *rA\ ) Fig. 15. Jordans method. Appearance of Image for two positions of ube whenrods^and foreign body are in same level. 163 164 X-RAY MANUAL—U. S. ARMY bodies in the same vertical plane but in different hori-zontal planes.

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. X-ray manual : Army . Fig. 12. Carvers Fig. 13. To show how movement of shadows varies wit h distance from screen162 [& */ ~PoSiriojr focus at n ) T -6 $irto«,F0lV$AT^ ^ Fig. 14. Jordans method. Appearance of image for two positions of the tubewhen rods and foreign body are at different levels. ( posjrjMjrocus *t f^ \ 73 JL (/ST TotiTfOJf, Focus *rA\ ) Fig. 15. Jordans method. Appearance of Image for two positions of ube whenrods^and foreign body are in same level. 163 164 X-RAY MANUAL—U. S. ARMY bodies in the same vertical plane but in different hori-zontal planes. With a source of light at (M) theshadows C, A and B will be cast in a straight line(vertical to the plane of the diagram) at (M). Butif the source of light be shifted to 1 or to 2 the shadowof C will move more and that of B less than that of A. Now transfer the same letters with the same signifi-cance to (Fig. 14) a diagram of a fluorescent is now the foreign body, C is a rod in the same verticalplane but at a lower level, B is a rod

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