Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 415
tube-cells to the slides. The two former ofthese purposes are answered by liquid cements or varnishes, which,may be applied without heat ; the last requires a solid cement ofgreater tenacity, which can only be used in the melted state. Amongthe many such cements that have been recommended by… … Fig. 325.—Zeisss cover-glass tester. VARNISHES AND CEMENTS 383 that the two cements on which the most complete trust may Ij«- re-posed M i1 j<(p(vnner*t gold rize and l»<lVa cement. This opinion is the result of over twenty years of special observation. A good von ttsh may easily, in a…
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