rue when mono-ehro-inatic light and even when petroleum light is used. In case the two foci are sounlike in an objective, it would he better to discard it for photography altogether,for the estimation of the proper position of the sensitive plate after focusing isonly guess work and the result is… … Fig. 146. Walmsleys Autograph Pkoto-Micrographic Camera in a vertical po-sition. Compare Fig. i+j {From the Proc. Amer. Micr. Soc. Vol. XVII, sSoj). CH. VII/A PHOTO-MICROGRAPHY. 191 screen. They should he carefully tested to see if there is coincidence in positionof the focusing screen and the…
Microscopy
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