Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 36
d by Mr. Traviss (Fig. 22), onthe principle of a reversed iris dia-phragm, is a very convenient appliance. Fig- 22.-^No. 3284, Tra-By moving the handle the size of the ^ss Patch-stop, central patch is enlarged or diminished. The high-power dafk-ground iUuminator is a reflecting device mgii-powerby… … 34 . THE MICROSCOPE
Microscopy
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