American practice of surgery : a complete system of the science and art of surgery . Fig. 197.—Illustrates underdeveloped plate of renal calculus. (The same radiograph as that shownon p. 615). Negative so thin that even under diffused light calculi cannot be seen. (Original.) upon as compared with the rest of the plate. For this reason many operatorsadvise the use of slow dilute developers, thereby avoiding the tendency of theimage to flash up, wliile the high lights become overdeveloped before the shadows. Fig. 198.—Illustrates normal development of the same subject as that shown in Fig. 197.
American practice of surgery : a complete system of the science and art of surgery . Fig. 197.—Illustrates underdeveloped plate of renal calculus. (The same radiograph as that shownon p. 615). Negative so thin that even under diffused light calculi cannot be seen. (Original.) upon as compared with the rest of the plate. For this reason many operatorsadvise the use of slow dilute developers, thereby avoiding the tendency of theimage to flash up, wliile the high lights become overdeveloped before the shadows. Fig. 198.—Illustrates normal development of the same subject as that shown in Fig. 197. (Original.) can be fully brought out. Usually the image will appear in about fifteen secondswith this developer, and development may be continued for about six minutes. It is advisable then to look at the plate by holding it up to the ruby light;it should be placed over a sink so that the developer will not drop on the develop-ing bench. If the bones can be seen distinctly, showing quite light, develop- 624 AMERICAN PRACTICE OF SURGERY. ment has not been carried far enough and should be continued until, when theplate is held about six inches from ruby light, the bones can hardly be plate shoukl next be rinsetl in cold water. This is important. It not onlychecks further development, but aids the action of the fixing and hypo bathsin wliich it must he now placed before it is exposed to white light. The hypobath is usually acid in reaction. The tleveloper is alkaline in reaction. If weput t
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