) Centralpart with oblong cover-glass over Canadabalsam on the ground surface to render ittransparent. X. The central point inthe entire focusing screen; It ts madewith a black lead pencil on the groundsu rface. The focusing glass is focused onthis cross, then when the image is in focusit will be… … (II. I III] PHOTO-MICROGRAPHy Naturally for the vertical camera the- light will come from the side and ifrom a skylight, although good results are obtained with a skylightplaces the camera that it does not cast objectionable Bfladows, As shown in bigs. 161, [65, the object is placed upon a glass…
Microscopy
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