Photo Micrography Including a Description of the Wet Collodion And Gelatino Br
Photo Micrography Including a Description of the Wet Collodion And Gelatino Br
A Cowley Abraham Cowley Malley
The book Photo Micrography Including a Description of the Wet Collodion And Gelatino Br was written by author A Cowley Abraham Cowley Malley Here you can read free online of Photo Micrography Including a Description of the Wet Collodion And Gelatino Br book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photo Micrography Including a Description of the Wet Collodion And Gelatino Br a good or bad book?
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81 should be allowed to reach them. The dark slide should be carefully examined, and if of the double dry form, two sheets of zinc the same size as the plate, each covered with black velvet on one side and having a spring between them, should be placed with the velvet side next the back of the plates, in the dark slide. The following formula for the preparation of dry plates, having given almost perfect results; our opinion as to their purchase, has been considerably modified since the publicat...ion of the last edition. Its production is due to Mr. Hartley of Chicago, and is here inserted in almost his own words. FORMULA. Take any hard gelatine Swiss or Heinrich's soak it for twelve hours in water, changing the water three times during the twelve hours. Do not cut it up. Take it out of the water and lay it on clean paper to dry. No matter how much of this you fix in this way, as when dry it will keep as before. Take 75 grains of carbonate of soda (not bicar- bonate) and 60 grains of citric acid, and put into three ounces of warm water in a quart pitcher; when the citric acid and carbonate of soda are dis- solved and all effervescence ceases and carbonic acid gas has passed off, add 16 ounces cold water and 720 grains of the soaked and dried gelatine and let it stand thirty minutes ; now dissolve 720 grains of G 82 PHOTOGRAPHIC PROCESSES.
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