complished by the use of some form of camera lucida(Ch. V), that of Wollaston being most convenient as it may be 120 MAGNIFICAT/OX AND MICROMETRY [CH. II used for all powers, and the determination of the standard distanceof 2jO millimeters at which to measure the images is readily deter-mined (Fig.… … Fig. 107. Abbes Test Plate to show the enclosure of the micrometer lines•by small rings. See also Fig. 75. It is somewhat difficult to find the micrometer lines. To avoidthis it is well to have a small ring enclosing some of the micrometerlines (Fig. 107). The light must also be carefully…
Microscopy
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