Theory and Practice of the Photographic Art: Including Its Chemistry and Optics with Minute Instruction in the Practical Manipulation of the Various Processes, Drawn from the Author's Daily Practice
Theory and Practice of the Photographic Art: Including Its Chemistry and Optics with Minute Instruction in the Practical Manipulation of the Various Processes, Drawn from the Author's Daily Practice
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1856 Excerpt: ...or xylo-iodide--for, chemically speaking, there is no difference in the two--it is necessary that the ether should contain a certain quantity of alcohol, or the different articles are not soluble; therefore, if we take a fresh bottle and coat the plate from this while it contains its full dose of ether, and with the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1856 Excerpt: ...or xylo-iodide--for, chemically speaking, there is no difference in the two--it is necessary that the ether should contain a certain quantity of alcohol, or the different articles are not soluble; therefore, if we take a fresh bottle and coat the plate from this while it contains its full dose of ether, and with the thermometer ranging between 60 and 70, the evaporation of this article will be very rapid, and consequently a tough film soon formed; but if, on the other hand, we are using an article which has been in use some time, and many plates, perhaps, coated, the proportion of alcohol will be much greater, and not being of so volatile a nature, will necessarily take a longer time to acquire the necessary firmness for immersion. Hence it is evident we must be guided by circumstances. If, for instance, after coating a plate, we find on immersion it does not colour freely, we have then reason to suppose the plate has not been immersed sufficiently quick; but if, on the other hand, we find the film very tender, and it cracks upon drying, then we have reason to know that plates prepared from that bottle must not be immersed quite so soon. The larger the proportion of alcohol the more tender the film, but the more sensitive will bo the plate, and the quicker and more even will be the action of the bath. "The next question also often asked is--How long must be the exposure in the camera? a question more difficult to answer than the last, and which practice alone can determine, combined with close observation of those parts which should be the shadows of a picture. If, for instance, in developing, we find those parts less exposed to the light than others develop immediately the solution is applied, then we have every reason to suppose the exposure has been...
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Add this copy of Theory and Practice of the Photographic Art: Including to cart. $41.39, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
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