Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 233
arts byweight, absorbs two equivalents or 252parts by weight of iodine. From which itfollows that in proportion as the commer-cial cyanuret absorbs less than this quan-tity, so is it contaminated. The decora-poti ion here mentioned is perfectly wellknown to chemists and was fir^t describedwe b… … N tbe hisforical section thedescription of the calotype tas published by Mr FoxTalbot, is given. Whilethese sheets have been pass-ing through the press, Mr.Henry Fox Talbot has an-nounced his intention of making thecountry a free gift of all his patents,reset ving only the right of takingportraits…
Photography · Art and photography
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