Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 245
ctive, at aproper distance forthe focus, may thenbe plunged into theaquarium. Indeed, thetube of the instrumentmay be so protectedas to work for somedepth, and have somerange in the water ofa o-ood-sized tank. A beautiful instru-ment of this class hasbeen devised by Mr.J. AY. Stephenson forthe… … the bar, and it can.be clamped at anygiven point by theupper nulled head. Themilled head at the side, by pressing on a loose plate, fastens thebar securely to theaquarium. Between the ends of (he bar slides ann rm carrying a, sprung-socket, and the armcan be clamped at anygiven point of the…
Microscopy
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