Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 181
Parabolic Illuminator. parallel rays r r r, entering its lower surface perpendicularly, passon until they meet its parabolic surface, on which they fall atsuch an angle as to be totally reflected by it (§ 2), and are all directedtowards its focus, p. The top of the Paraboloid being ground outinto a…
Microscopy · Biology
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