The microscope is focused on the object using a band of yellow-green light the wave lengths of which differ by only 1.63mμ. The light filter used for this purpose is described. In focusing by this light the apparatus is so adjusted that the rotation of a screw through a few turns between automatic stops brings the microscope automatically into precise focus for the light employed in making the photograph.

© 1923 Optical Society of America

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Figures (1)

Fig. 1
Fig. 1

Automatic focusing device for photomicrography with ultraviolet light.