the ocular for drawing or the deter-mination of magnification, the center of the hole in the silveredsurface is placed in the optic axis of the microscope. This is doneby properly arranging the centering screws that clamp the camerato the microscope tube or ocular. The perforation in the… … r- ■-*& FlG_ I28i Aooe Camera Lucida in Position.—The frism over the ocular may be turned aside for directobservation. Jlie light modifiers for drawing surfaceand microscope are in connection with tin prism. TheM prism has centering screws and niav he moved up ordown -with the whole apparatus…
Microscopy
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