File:The American annual of photography (1918) (14594754408).jpg

Identifier: americanannualof1918newy (find matches)
Title: The American annual of photography
Year: 1918 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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a piece of wet cottonand then start all over again. There is quite a thickness be-tween the film side and the matt side of the ground-glass. Thisis an advantage for it softens the edge of retouching. One ortwo extra pieces of clear glass may sometimes be used to ad-vantage for softening the retouching, especially where cloudsare worked in. Films may be worked the same way by bind-ing the film to the ground-glass, but in most cases the filmwill be small, and the retouching will be outlined too sharply,so it is advisable to use an extra piece of clear glass to makethe distance greater between the film and ground-glass, whichwill soften the hard lines of the retouching. I could go on at length telling of the many things that couldbe done with ground-glass and graphite, and show illustrations,before and after treatment, but I am afraid that the Editorwill cut down what I have already written. Just give the method a trial. It costs little and no risk isrun with any negative you try it on.
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THE FIRST SNOW. EDWIN J. WHITE. 264 PHYSICAL AND CHEMICAL CHARACTERISTICS OF PHOTOGRAPHIC DEVELOPERS (Analysis) By Samuel Wein The number of organic compounds used as photographic developershas increased to such a large extent, and the need of a summary ofthe general characteristic reaction of these substances led the writer toinvestigate these. His observations are given in routine form. The developers reviev^ed in this paper are only those that have be-come popular and in use every day. In making tests, the investigator is advised to do this in the sys-tematic manner given : viz.:—commercial name ; chemical name ; con-stitution formula, crystalline formation, melting point, solubility,behavior to alkalies, acids, oxidizing agents, and milk enzymes. The chief commercial developers may be classified into:—Para-midophenol, Diamidophenol, Methyl-paramidophenol, Methyl-ortho-amidophenol, Pyrogallol, Pyrocatechin, Hydroquinone (and haloid sub-stitution products) Monobrom or Chlor-hydr

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