. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . n be held by the examiner who manipulates it, byviewing it from different angles, or an assistant holds the plate and theoperator examines it from different distances and angles. 15 226 ELECTEO-THERAPEUTICS. A better plan is to place the negative in a window, low-er the cur-tain, and allow the light to come through the negative. I often preferto place the negative in the window of the dark room and examine iteither alone or by a similar negative of the corresponding part of thesame person; if this be not possi
. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . n be held by the examiner who manipulates it, byviewing it from different angles, or an assistant holds the plate and theoperator examines it from different distances and angles. 15 226 ELECTEO-THERAPEUTICS. A better plan is to place the negative in a window, low-er the cur-tain, and allow the light to come through the negative. I often preferto place the negative in the window of the dark room and examine iteither alone or by a similar negative of the corresponding part of thesame person; if this be not possible, I employ the negative of someother person and then compare them side by side. Another easy methodis to place the negative in a photographers retouching desk, which is sovery convenient for small negatives. I have devised a viewing box (Fig. 109) which I employ at thePhiladelphia Hospital. This box accommodates any sized negative and iscapable of rotation, and thus without any displacement the negative canbe viewed at any angle and also in the vertical or horizontal Fig. 109.—Authors negative-viewing box This box contains three series of eight c. p. lights behind the groundglass. When a dim or weak light is desired for less dense negatives, oneseries of lamps is lighted ; if strong light is desired, the !No. 2 switch isturned on and greater illumination is produced. This box contains per-forations and is lined with asbestos. The preferable light for the exam-ination of negatives is white (day) light or the electric light. Theintensity of the light can be regulated by the interposition of eitherground glass or a rheostat, as necessity requires. A. Foreign Bodies. In interpreting a negative for a foreign body, exclude all possibleerrors, such as white spots produced by air bubbles during development, THE PEII^CIPLES OF TECHNIC. 227 the presence of iodoform, lead water and laudanum, etc., that may be onthe bandage or dressing. Metallic foreign bodies will eclipse
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