Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 288
e has now produced anachromatic condenser, ostensibly for use in high-power photographicwork, but in fact of much more general utility. It consists of a singlefront with two double backs, and it projects a sharp and perfectlyachromatic image of the source of light in the plane of the object.Its… … Fig. 211.—Abbes achromatic condenser. only an aplanatic cone of *5, this instrument yields a similar cone of•65. Like its predecessor it is large and heavy ; and, with great defer-ence and respect to our Continental neighbours, we would suggest thatthis is a too general characteristic; the back…
Microscopy
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