. A text-book of radiology . ses, of course, it doesnot matter, but in the diagnosis of renal calculi, anddifficult medical cases, early changes in disease of bonesand joints, etc., it will be found more easy to come to adecision if we make our examination as soon as possibleafter fixing. The plate is seen to the best advantage with the aid ofa photographers retouching easel suitably adapted totake plates of the sizes used in radiography. The light 121 122 TEXT-BOOK OF RADIOLOGY. should be cut off from around the plate by masks orscreens, and such as reaches the plate itself should bediffused
. A text-book of radiology . ses, of course, it doesnot matter, but in the diagnosis of renal calculi, anddifficult medical cases, early changes in disease of bonesand joints, etc., it will be found more easy to come to adecision if we make our examination as soon as possibleafter fixing. The plate is seen to the best advantage with the aid ofa photographers retouching easel suitably adapted totake plates of the sizes used in radiography. The light 121 122 TEXT-BOOK OF RADIOLOGY. should be cut off from around the plate by masks orscreens, and such as reaches the plate itself should bediffused by means of opal glass. See Fig. 47. If the source of light is an incandescent lamp bulb, itis well to have an adjustable resistance at hand so that itcan be slightly dimmed if necessary, as slight differencesare obliterated if the illumination is too intense. It will be found most satisfactory to adopt artificialillumination for this work. It is uniform, always ready?and can be modified at will to suit special SPfeESS Fig. 47. Illuminating Desk lor X-ray negatives. A very good device is a japanned tin bos of semi-cylindrical form, on the flat side of which are grooves fora sheet of opal glass and for the largest size of X-rayplate it is desired to use. An electric lamp is mountedinside, and, in a somewhat darkened room, the plate canbe seen at its best. For smaller sized plates suitablecarriers are provided. When examining a very thinplate it will be found a great assistance to hold the platein a slanting direction so as to produce a certain amountof fore-shortening. This enhances the contrasts, and will INTERPRETATION. 123 sometimes bring out a shadow not easily seen when viewedfrom straight in front. The correct interpretation of an X-ray negative is anart not easily acquired except for the simpler cases. Medical cases give the greatest difficulty, and evenafter a large experience new and strange appearances arecontinually cropping up—chiefly because physici
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