Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 36
with it forms potassa,and the hydrogen goes to thc.sulphoeyano-gen, and the sulphur and sulpheret of ironremain mixed with it in an undisturbedstate. The sulpbocyanate of potassa is thenpoured into a retort, and sulphuric acidadded ; the acid combines with the potash,and sets free the sulphocyanic… … \ have shown in the pre-ceding chapteis the parti-cular properties of fourpreparations rendered sen-sitive by their combinationwith the aceto nitrate ofsilver. We are not obliged, therefore, inthis pl-ce to discuss the choice ofmodels, nor the time of exposition,but only the general dispositions…
Photography · Art and photography
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