. Röntgen ray diagnosis and therapy . aced on a table,so that the soles of his feet rest on the latter. As a rule, tubes ofmedium hardness are most useful in fluoroscopy. In order to study any region of the body with leisure, and toobserve its structural details, a skiagraphic exposure is most instances the patient is skiagraphed best in the recumbentposition. This may be done on one of the tables which are pro-vided with a box for receiving the photographic plate (Fig. 37).The patient may also be placed on the carpeted floor. This sim-ple arrangement offers the advantage of a wid
. Röntgen ray diagnosis and therapy . aced on a table,so that the soles of his feet rest on the latter. As a rule, tubes ofmedium hardness are most useful in fluoroscopy. In order to study any region of the body with leisure, and toobserve its structural details, a skiagraphic exposure is most instances the patient is skiagraphed best in the recumbentposition. This may be done on one of the tables which are pro-vided with a box for receiving the photographic plate (Fig. 37).The patient may also be placed on the carpeted floor. This sim-ple arrangement offers the advantage of a wide operating fieldaround the patient. The extremities can be placed in any position58 EXAMINATION OF THE PATIENT 59 desired, and blocks, .sand-bags, large books, etc, may be used tosurround and immobilize the area to be skiagraphed. In the caseof nervous children there is no fear of their falling from thetable. The tube-holder is placed best between the Ruhmkorff coil andthe patient. The wires connecting the secondary terminals of the. Fig. 37.—Queens Examining Table. Euhmkorff coil with the tube may be loosely hooked in the ter-minals. These must be kept separate in order to avoid shocks. Theircalibre should be very small, but they must be surrounded by athick layer of insulating material. The anticathode should be connected with the anode, and theanode with the positive electrode of the Ruhmkorff apparatus,while the cathode is to be connected with the negative electrodeof the apparatus. The tube-holder must permit the tube to bemoved in any position desired. A false direction of the current is 60 THE KONTGEN RAYS indicated by the appearance of a marked shadow originating fromthe anticathode and the formation of blue light. The distance of the tube is also a matter of great distances produce various relations. The smaller thedistance is between the tube and the plate, the larger the silhouetteof the irradiated part appears. On the other hand, the smaller t
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