. The microscope and microscopical methods. Microscopes; 1896. 190 PHOTO MICROGRAPHY. [CH. VIII. arisen from differences in the foci. This is especially true when mono-chro- matic light ami even when petroleum light is used. In case the two foci are so unlike in an objective, it would be better to discard it for photography altogether, for the estimation of the proper position of the sensitive plate after focusing is only guess work and the result is only mere chance. If sharp pictures cannot be obtained with an objective when lamp light ami orthochromatic plates are used the fault may not res
. The microscope and microscopical methods. Microscopes; 1896. 190 PHOTO MICROGRAPHY. [CH. VIII. arisen from differences in the foci. This is especially true when mono-chro- matic light ami even when petroleum light is used. In case the two foci are so unlike in an objective, it would be better to discard it for photography altogether, for the estimation of the proper position of the sensitive plate after focusing is only guess work and the result is only mere chance. If sharp pictures cannot be obtained with an objective when lamp light ami orthochromatic plates are used the fault may not rest with the objective but with the plate holder ami focusing. Fig. I4*S. Walmsley's Autograph Photo-Micrographic Camera in a vertical po- sition. Compare Fig. /// (From the /'roe. Amer. Micr. Soe. Vol. XVII, /S95).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. Ithaca, N. Y. , Comstock
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