Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 151
r-of-Paris disk just described) over the ordinarymirror. A concave surface of plaster-of-Paris, moreover,might easily be obtained, by casting it when fluid uponthe convex surface of such a plate. When a concavity isthus given to the white sui-face, its performance with lowpowers is nmch improved;… … WTiite-Cloud Illumiiiator. ■WHITE-CLOUD AND OBLIQUE ILLUMINATOES. 129 become apparent when very high powers are used and difficultobjects are under examination; and to obtain the most per-fect white-cloud illumination possible, is the object of theapparatus devised by Mr. Gillett. This consists of…
Microscopy
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