. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Method for photographing Spine. — It is uncomfortable for the patientto lie on a hard glass plate, and pressure or the moisture of perspira- METHODS OF EXAMINATION 95 tion may injure its surface; there is also the risk of breaking it to beconsidered, even when it is supported on a board ; but the comfort ofthe patient and the safety of the plate may be secured when the spine,. for instance, is to be photographed, by simply supporting the plate ont
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Method for photographing Spine. — It is uncomfortable for the patientto lie on a hard glass plate, and pressure or the moisture of perspira- METHODS OF EXAMINATION 95 tion may injure its surface; there is also the risk of breaking it to beconsidered, even when it is supported on a board ; but the comfort ofthe patient and the safety of the plate may be secured when the spine,. for instance, is to be photographed, by simply supporting the plate onthe diaphragm, as shown in Fig. 72. In this way the plate is broughtinto close contact with the spine, the patient is comfortably supported THE ROENTGEN RAYS IN MEDICINE AND SURGERY the canvas stretcher, and yet no moisture from or weight of the^^.ient comes upon the plate. X-Ray Negatives compared with X-Ray Photographs. — X-ray nega-tives show more detail than the prints made from them; and, further,the negatives themselves may show some things in the process of devel-opment which are lost in the finished negative. Negatives when dryare denser and better than when wet. Careful Examination of Negative. — A negative should be examinedcarefully and systematically by a suitable and variable illumination inorder to see best what it shows. Sometimes certain things are seen mostclearly when the negative is held above a large sheet of white paperwhich reflects the light from a window; often certain points areobserved
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