Beale, Lionel S. (Lionel Smith), 1828-1906 · London, Harrison · leaf 280
nly enclosed between twopieces of the thinnest covering glass, and the focus very close.The prism he seldom employs alone, but places in the tube at theback of the stage a condenser. A small Coddington lens, about16° angular aperture, served him in the earlier part of his experi-ments. This was… … Kg. 223.
Microscopy
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