. Elementary and dental radiography . nd 75degrees F. It too cold, development takes place slowly, and the negative,when finished, is pale and thin. I use tap water in the winter and haveno trouble due to improper temperature. In the summer, though, evenusing ice water and ice, the work is often discouraging. If possible dur-ing the hottest weather defer development until the cool of the evening. *If crystal^ arc used, double the quantity. MAKING RADIOGRAPHS 77 When development is complete, remove thefixing. plate, dip it in clear water, then immerse it in the fixing bath. The fixing bath is a
. Elementary and dental radiography . nd 75degrees F. It too cold, development takes place slowly, and the negative,when finished, is pale and thin. I use tap water in the winter and haveno trouble due to improper temperature. In the summer, though, evenusing ice water and ice, the work is often discouraging. If possible dur-ing the hottest weather defer development until the cool of the evening. *If crystal^ arc used, double the quantity. MAKING RADIOGRAPHS 77 When development is complete, remove thefixing. plate, dip it in clear water, then immerse it in the fixing bath. The fixing bath is a solution of chem-icals which dissolves out the unaffected silver. Leave the plate in thefixer for two or three minutes after the milky appearance of the glassside of the plate has disappeared. A plate must be removed promptlyfrom the developer as soon as development is complete, or the negativewill be overdeveloped, spoiled, but it may be left in the fixing bath forhours longer than necessary without danger of spoiling the Fig. 73. Titubator. It will not injure the plate to remove and replace it in the baths atany time during developing or fixing. The actual time required for fixing varies from 5 to 20 or 30 min-utes. The thicker the emulsion the longer time it requires for of the fixing solution over the surface of the plate will hasten 78 ELEMENTARY RADIOGRAPHY fixing. A titubator (Fig. y^ ls a machine on which the fixing bath traymay be set, and the bath kept in constant movement over the plate. When several negatives are being made at the same time, it is wellto n>e a fixing box (Fig. 74) instead of a tray. If the plates were piledone on another in the tray, they would probably stick to one another and,when pulled apart, the emulsion would be scarred. The plates stand onend in the fixing box, fitting into grooves. Hyposulphite of soda is the standard fixer. There are not a greatnumber of fixers, as there are of developers, to choose from. Hypo
Size: 1014px × 2464px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1913
