Background
Jones, H. Chapman was born in 1854 in City of London. Son of Charles James Jones.
(This historic book may have numerous typos and missing te...)
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. 1895 Excerpt: ...the regenerated developer is not brought back to its original condition; it has an additional amount of restrainer. Some operators like old developers because they give brilliancy, though they hesitate to add a restrainer to a new developer; they like the effect of the bromide when they do not know that it is present. CHAPTER IV. Gelatino-bromide Negatives. Development With Pyrogallic Acid. DEVELOPMENT with pyrogallic acid (C„H3(OH)3) in solution with an alkali has the advantage of giving the operator more power to vary his developer to suit the peculiarity of his subject, and a greater convenience in making such changes as may be necessary during development. For general work there is no developer that can be more advantageously employed than this. To realise the full benefit of it, each constituent should be kept separately. This method also has the advantage that if one of the chemicals deteriorates it does not involve the loss of another. But these observations do not apply when a considerable number of very similar negatives have to be developed, as often occurs in studio work. The pyrogallic acid is conveniently kept in the solid condition, as its decomposition is then entirely prevented, and it is almost as easy to measure the solid substance as a solution of it. But if it is preferred to have the pyrogallic acid in solution, it may be dissolved in a convenient quantity of water, say to form a ten per cent. solution, and a little citric acid may be added to it, as little of the acid being used as is found to preserve the solution for the required time. It is well not to dissolve more pyrogallic acid than will serve for two or three days' use. The precautions necessary in preparing, purchasing, and dissolving sodium sulphite have been pointed ou...
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Jones, H. Chapman was born in 1854 in City of London. Son of Charles James Jones.
Studied at private school.
Late Honourable Secretary and Vice-President of the Royal Photographic Society. Lecturer on Photography at the Imperial College of Science and Technology, South Kensington.
(This historic book may have numerous typos and missing te...)
(Lang:- eng, Pages 173. Reprinted in 2015 with the help of...)
(Lang:- eng, Pages 212. Reprinted in 2015 with the help of...)
Fellow of Institute of Chemistry. Fellow of the Chemical Society. Fellow of the Royal Photographic Society.
Spouse 1884, Phoebe Simmons,daughter of John Morley, Member Royal College of Surgeons, Licentiate of the Society of Apothecaries, of Barton-on-Humber.