The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 232
eweighted with about 50 or a hundred grams to keep the cord taut, thenwhichever one is pulled, the micrometer screw will respond at once.To cut off the light a piece of black velveteen is hung over the end ofthe objective. This can be removed without jarring the apparatus.An exposure of a few… … Fig. 182. Bulls eye lens and holder. (Bausch & Lomb Opt. Co.) COLOR-CORRECT PHOTOGRAPHY From the fact that the different wave lengths of light affect the photographicplate with different degrees of vigor, the ordinary photographic print of a manycolored object or landscape is not satisfactory.…
Microscopy
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