Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 125
mploying col-lodion in photography, Ihave occupied myself con-tinually with the prepara-tion of this substance, bymeans of which I have made nume-rous Droofs. The frequent results that I haveobtained makes it difficult for meto comprehend the ill success ofwhich the most part of operators… … the fact that the chemists are not success-ful in producing this agent in the requiredcondition. In effect, it is almost impossi-ble to regulate its density in an invariablemanner, but as to its composition, I haveobtained proofs with combinations so dif-ferent, with quantity so varied, that I…
Photography · Art and photography
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