The American annual of photography . ure of the emulsionto show certain irregularities which are likely to interferewith definition. Storing of Plates. Owing to the intensely strong penetrating power of theX-Ray more than the usual precautions for storing of thesensitized materials are to be observed. Experience hasproven that a large lead lined box is about the safest, mosteconomic as well as convenient way. In addition to the pro-tection against the ray care should be taken not to store theplates where they may be attacked by the fumes of suchchemicals as acetic acid, ammonia, nitric or sulp
The American annual of photography . ure of the emulsionto show certain irregularities which are likely to interferewith definition. Storing of Plates. Owing to the intensely strong penetrating power of theX-Ray more than the usual precautions for storing of thesensitized materials are to be observed. Experience hasproven that a large lead lined box is about the safest, mosteconomic as well as convenient way. In addition to the pro-tection against the ray care should be taken not to store theplates where they may be attacked by the fumes of suchchemicals as acetic acid, ammonia, nitric or sulphuric acid, astheir action upon the sensitive surface of the plate may provequite detrimental. Development.—Chemistry: After the light sensitive material has been exposed to theaction of the ray for a short time a chemical change takesplace which remains latent until the emulsion is subjected * Especially in stomach plates where peristaltic waves are to be considered andexposures of 1/10 of a second are required to stop motion. 82. NORMAL KNEE-JOINT SHOWING FOREIGN BODY IN KNEEJOINT (TIP OF NEEDLE). Illustrating article Photography as Applied to Radiography, by S. A. Schwarz. 83 to the action of an oxidising or reducing agent more com-monly known as a developer. Its action consists in removingthe bromine from the sensitized surface leaving behind adeposit of black metallic silver v^hich forms the image. The most popular reducing agent is Metol, or any one ofits substitutes taken from the Paramidophenol group, beingeither a sulphate or a chloride. This developer cateringsolely to detail does not by itself make a suitable compound,as it does not impart density to the negative. The addition ofHydrochinone vv^ill assist us greatly in overcoming this diffi-culty. There are very few developers which can successfullybe employed without the addition of other in order to act properly must be in alkalinesolution, the strength of the developer depending vastly upont
Size: 1417px × 1763px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
