Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 418
.—The simplest kind of compound microscope is formed by the combination of two converging lenses, whose axe- are placed in the Bame Btraight line. The arrangement of thelenses, and tin- path of the ray-, will he readily understood from the annexed diagram, FigMN is the object-glass, which has a vei…
Mechanical engineering
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