The microscope and its revelations . te-Glass andShalloiv Cells.—Eor mounting objectsof somewhat greater thickness than can be included within thin-glass cells, shallow ceUs may be made by drilling apertures of thedesired size in pieces of plate-glass of the requisite thickness,and by attaching these with marine glue to glass slides (Pig. 61).Such holes may be made not merely circular (a) but oval (c);and a very elongated perforation may be made, by drillmgtwo holes at the required distance and then connecting themby cutting-out the intermediate space (b).—These operations,however, can scarcel
The microscope and its revelations . te-Glass andShalloiv Cells.—Eor mounting objectsof somewhat greater thickness than can be included within thin-glass cells, shallow ceUs may be made by drilling apertures of thedesired size in pieces of plate-glass of the requisite thickness,and by attaching these with marine glue to glass slides (Pig. 61).Such holes may be made not merely circular (a) but oval (c);and a very elongated perforation may be made, by drillmgtwo holes at the required distance and then connecting themby cutting-out the intermediate space (b).—These operations,however, can scarcely be performed by any but regular glass-cutters, and, being troublesome, are expensive; hence theplate-glass ceUs have been generally superseded, either bytube-Q,t]\s> (§ 137) or by built-up cells. Although the formermay be reduced to any degree of shallowness that may be 252 MOUNTING OE OBJECTS. desired, and are made of most of the sizes and forms that canbe ordinarily needed, yet for extra-sizes or peculiar forms, Fig. l^
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
