Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 252
ight angles to the filaments by a scaleformed of a thin plate of brass having notches at its edge, whosedistance corresponds to that of the threads of the screw, every fifthnotch being made deeper than the rest to make the work of enume-ration easier. In the original Ramsden eye-piece one filament… … Fig. 175.—The micrometer eye-piece. <with the other edge of the object; the number of entire divisions onthe scale then shows how many complete turns of the screw had!been made in the separation of the wires, while the number of index-points on the edge of the milled head shows the value of the…
Microscopy
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