. The book of photography; practical, theoretical and applied. d the mixtureboiled to coagulate the albumen ; thesolution is then filtered through flanneland the glycerine and camphorated spiritadded. For mounting, the glycerine jelhis melted down by a gentle heat, a droptaken out on to the slide on which theobject has been placed ; it is then coA-eredAvith a thin glass circle as described forCanada balsam. Sections of Wood, Minerals, etc Sections of wood, seeds, etc., areobtained by cutting with a razor upona simple section cutter (Fig. 723). Asection of hard material such as bone. PHOTOMICRO
. The book of photography; practical, theoretical and applied. d the mixtureboiled to coagulate the albumen ; thesolution is then filtered through flanneland the glycerine and camphorated spiritadded. For mounting, the glycerine jelhis melted down by a gentle heat, a droptaken out on to the slide on which theobject has been placed ; it is then coA-eredAvith a thin glass circle as described forCanada balsam. Sections of Wood, Minerals, etc Sections of wood, seeds, etc., areobtained by cutting with a razor upona simple section cutter (Fig. 723). Asection of hard material such as bone. PHOTOMICROGRAPHY. 537 rock, etc., is obtained by cutting withan iron disc which is mounted on amachine somewhat like a lathe, andcaused to revolve at a high rate of speed ;for very hard substances the cutting discis fed with fine emery and water. The their natural state; they are bleachedby immersion in Eau de Javelie or asolution of hypochlorite of soda, whichis made by mixing solutions of car-bonate of soda and chloride of are stained by immersion in solu-. Fm. 722.—Rocking JIicrotome. section thus obtained is not sufficientlythin to be transparent; it is mounted ona glass slip and rubbed down, first on agrindstone and then on a Water-of-Ayrstone until perfectly flat and smooth onthe one side ; it is then removed and re-cemented upon another slip of glass, andrubbed down on the opposite face untilit is equally smooth and the section is sothin as to be quite transparent. Greatcare is requii-ed at this point, becauseany rough treatment would result in thewhole or a great part of the preparationbeing rubbed away, and the labour ofmany hours might be altogether the section is sufiiciently thin, aSin. X 1 in. glass slip is cleaned and madehot, a small quantity of melted Canadabalsam is placed in the centre of it, andthe section transferred to the slide ; thenmore Canada balsam is put on, and thewhole covered with a thin glass circle orsquare. Vegetable Tissues, Diato
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
