File:The American annual of photography (1914) (14779848882).jpg

Identifier: americanannualof28newy (find matches)
Title: The American annual of photography
Year: 1914 (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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s a good one will only cost a fewcents more, and you will find that you will respect its costenough that you will take better care of it than of the cheapone, and by consequence it will last you longer. These by theway are sold as chemical thermometers, and you will do wellto get one reading to 100 deg. centigrade as that is the boilingpoint in this system. I have known trouble with tank develop-ment which was entirely the fault of the handy little ther-mometer which you could hang on the side of the tank and itwould lie to you about the warmth of your solution. Next a good clock—there are half a dozen on the market,all good, with possibly the Watkins a little in the lead, and ifyour purse is long enough, one of the ingenious little contriv-ances known as an interval timer, which will pay for itself inthe first batch of plates you would have forgotten, in the tank.Then chemicals^oh, dear, how that word is abused. Theawful stuff that is sold as being suitable for photographic pur- 42
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MOTHER AND CHILD. GILL & SON. poses which really is not fit for anything. Sulphite which con-tains about ten per cent sulphate, carbonate which containseighty-six per cent sodium carbonate, and the balance miscel-laneous sodium salts, dirt and not infrequently sodium hydrate.These two chemicals can be bought cheaply of any of thechemical supply houses, though any dealer will supply a C. P.chemical if asked. If one gets an impure carbonate it can be tested easilyenough, although the work probably requires more knowledgeof chemistry than the amateur is fortunate enough to beblessed with. Sulphite also may be easily tested, but if oneis careful to see that their chemicals are made by first rate firmsand are marked C. P., and have an analysis on the bottle, theycan be reasonably sure that there will be no trouble with thispart of the work. I can recommend the Mallinckrodt chemi-cals obtainable through any stock house, and the excellentchemicals of Baker & Adamson. Others make C. P

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