Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 254
of the outer box. This gives about one inchof screw movement to the inner box, which causes the webs totraverse the field of the microscope. It must be remembered that,this in no way affects the movement of the movable web from thefixed, which can alone be accomplished by turning the… … Fig. 177.— Nelsons new form of screw micrometereye-piece. Immediately below the web is an iris diaphragm. This permitsa diaphragm to be used suitable to the power of the eye-pieceemployed. A guiding line at right angles to the webs lias beenadded. Care must be taken to observe that when the…
Microscopy
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