The book The Photographers' book of Practical Formulae was written by author Holmes, W. D., Comp Here you can read free online of The Photographers' book of Practical Formulae book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Photographers' book of Practical Formulae a good or bad book?
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Then if a friend enters your dark room to develop a plate you can acquaint him with the strength of your solutions and he is at once able to proceed with confi- dence. You may lose your note-book and yet prepare your solutions in any quantity at any time. 73 I still use the same developer that I did when I com- menced dry-plate photography, and I see no reason for change ; yet any other may be as good. It is as folloM's : No. I. Acid pyrogallic, . . 437^ grains (i oz ) Acid citric, . . . 60 " S...odium sulphite, crystals, . 4 ozs. Water, . . . . 16 fl. ozs. No 2. Sodium carbonate, . . . .24 ozs. Sodium sulphite, crystals, . . 4 " Acid citric, ..... 240 grains. Water, 80 fl. ozs. My No. I solution contains about 26 grains of pyro- gallic acid in one ounce, and No. 2 about 100 grains of alkali in one ounce. With i}4 fluid drachms of No. i and 2 fluid drachms of No. 2, 10 drops of a solution of bromide of potassium (45 grains in one fluid ounce of water) and water to make 8 fluid ounces, I commence developing any 6% x 8^ plate that I may have exposed.
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