Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 227
ch a square bar about 3£ inches long slides ratherstiffly : and one end of this bar carries another joint, to which isattached a ring for holding the lenses. By lengthening or shorteningthe pillar, by varying the angle which the square bar makes with itssummit, and by sliding that bar through the… … ffARE Fig. 156.—Becks portable microscope. taken in all instances that the ring which carries the lens should (by•means of its joint) be placed horizontally. At A is seen the position SIMPLE LENS OR LOUP-HOLDERS 203 which adapts it best for picking out minute shells or for other…
Microscopy
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