Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 559
. An inclination ofthe plane of the mirror 80° to the axis of the telescopehas been adopted by Professor Smith, and is found toanswer the purpose. It was the original design ofthe inventor to make the reflector so far wedge-shaped as to throw the reflection from the secondsurface out of the field,… … DOUBLE AND TRIPLE MICROSCOPES. 543 Fig. 113. easily found by trial. The only instruments as yet made on this planhave been constructed by Professor Smith with his own hands. Thewriter, by actual experiment, has found the performance to be in a highdegree satisfactory. Mr. Nachet exhibited in the…
Machinery · Scientific apparatus and instruments
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