File:The American annual of photography (1922) (14594923319).jpg

Identifier: americanannualof36newy (find matches)
Title: The American annual of photography
Year: 1922 (1920s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
on in the dark-roomcan be accomplished in two distinct ways. Either by tray ortank. Both ways are good, give splendid results, and haveattained a widespread popularity. In hospitals where thedepartments of radiography and photographic research aretwo of the most important divisions the development of allplates and films coming from the X-Ray department iscarried on in large tanks. Some of these tanks hold 25gallons of solution and accommodate from 24 to 36 14 x 17plates. In places where the quantity of the plates is large,tray development becomes practically impossible. Thetechnique of development does not differ from ordinarydevelopment to any great extent excepting that the processis carried quite a good bit further. This is especially the casein bone lesions where a good bit of density as well as detailis wanted. After the plate is fully developed it is washedfor a few minutes, and is then inserted into a bath of acidhypo. Here the unexposed silver is dissolved and the negative 86
Text Appearing After Image:
IN CHILMARK. G. W. HARTING. 87 rendered transparent. After fixation is completed the platesare washed for one hour in running water and then hungup to dry. It might not be amiss to mention here a few of the mostcommon causes of failure and perhaps suggest remedies forthem. 1. Plate slow in starting—Developer too cold or plate undertimed. 2. Lack of detail in the shadows—Wrong exposure, not enough time. 3. Plate flashes up within a few minutes—Greatly overtimed. 4. Mottled plate—Developer not agitated. 5. Finger marks—Careless handling. 6. Frilling—Developer too warm, or too alkali. 7. Unevenly developed plate—Not flooded evenly at beginning. 8. Blisters—Uneven temperature of the various solutions used. Acid hypo too strongly acid. 9. Pinholes and spots—Plates not dusted before loading. 10. Round white spots—air bells—Caused by carelessly inserting plate into developer. 11. Negative yellow or otherwise discolored—Impure sodas, or old developer. 12. Dense negativ

Note About Images