. Radiography, X-ray therapeutics and radium therapy . filled with water, the third with fixing solution, and thefourth again with water. The strips are taken out of the envelope either in the dark room or in thedark box mentionedabove, and are immersedin the developer for acertain time, as statedon the instructions withthe strips. The stripmust be kept in motionwhile in the same developer canbe used for several strips,but it deteriorates gradu-ally in contact with in photography, greatcare must be taken thatthe developer is not contaminated with hypo, and it must be at th
. Radiography, X-ray therapeutics and radium therapy . filled with water, the third with fixing solution, and thefourth again with water. The strips are taken out of the envelope either in the dark room or in thedark box mentionedabove, and are immersedin the developer for acertain time, as statedon the instructions withthe strips. The stripmust be kept in motionwhile in the same developer canbe used for several strips,but it deteriorates gradu-ally in contact with in photography, greatcare must be taken thatthe developer is not contaminated with hypo, and it must be at thetemperature stated on the instructions (18° C), because too cold a developerproduces far too light a tint. After development, the strip is washed for afew seconds in the second glass, and transferred into the third glass contain-ing the fixing solution. It ought to remain in this not less than a minute,but if it remains longer no harm is done. Then it is rinsed in the fourthglass, and is ready for comparison with the standard scale. (It need not be. ■Developing the strips KIENBOCK QUANTIMETER 285 dry for this purpose.) To leave a permanent record, the strip has to bewashed like any print for about half an hour in several changes of strips may be developed or fixed simultaneously by using a largeenough vessel. The Standard Scale consists of nine different tints, marked 0, |, 1, 2,3, 4, 5, 7, 10. The tint marked 1 is to be considered the unit, and is denotedby 1 x. It is half the value of the dose required to produce one unit inthe Holzknecht Chromo-radiometer, and one-tenth of the Sabouraud-NoireTint B dose. We therefore have : 10 x (Kienbock) = 5 H (Holzknecht) = 1 B (Sabouraud-Noire). If it is intended to administer the maximum dose in one sitting, it willbe a convenience to expose two strips of paper simultaneously. When,measuring the current passing through the tubes with a suitable rnilliampere-meter or judging the degree of fluorescence by experience, it
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