operly made, and the plane of the objectmust be parallel to the plane of the ground glass. Furthermore, as most ofthe objects in natural history have not plane surfaces, but are situated inseveral planes at different levels, the whole object may be made distinct byusing in the objective a diaphragm… … Fig. 161. Vertical Camera for photographing objects in a horizontal /Hon. The camera is attached to a double frame connected by bent metal pitfastened to the lower frame and sliding in a groove in the upper. I/rames can then slide over each other without separating. For moving theouter frame a rack…
Microscopy
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![An illustration from [Abercrombie & Fitch Co., New York : Christmas Catalogue, 1916] (1916)](https://img.insideoutlibrary.com/img/200/ia-abercrombiefitch00aber_0-4-6.webp)
