Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 228
g out minute shells or for other similarmanipulations, the sand or dredgings to l»e examined being spreadupon a piece of black paper and raised upon a book, a box, orsome other support to such a height that when the lens is adjustedthereto the eye may be applied to it continuously without unnecessa… … Fig. 157.—Swifts Stephensons binocular-, arranged for dissecting purposes. to bring a fresh portion of the matters to be examined into view ;and, generally speaking, it will be found convenient to place it onthe opposite side of the object, rather than on the same side withthe observer. At b is…
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