. joa .—Spencer-Winkelform of Mechanical Stage. It is readily attachableto any microscope with rectangular stage, by tzuo clamping screws on the right.Its range of motion is about 30 X 60 nun., thus enabling one to study as large aseries as is usually put on an ordinary slide. Fig. job.—{See next… … CH. II.] LABOR A TOR Y MICROSCOPES. 67
Microscopy
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