Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 253
ral one) will be in the middle of thefield the other at the margin, and the comparison will not be true-on account of the unequal magnification of the eye-piece through-out the held, whereas if the wire be placed rive notches on one side,,both measurements are brought more within the centre of the… … Fig. 176. by means of the measuring screw, so that the adjustment always;remains in the centre of the field of view. Fig. 176 illustrates this instrument, complete and in longitudinal*section. Each division on the edge of the drum corresponds to 0*002 nun.Whole turns are counted on a numbered scale…
Microscopy
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