Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 166
their obser- HARTNACKS EYE-PIECE MICROMETER. Ill Objective of l-12th-inch focus, the value of the divisions of theEye-piece scale may be reduced to l-25,000th of an inch; and as theeye can estimate a fourth part of one of the divisions withtolerable accuracy, it follows that a magnitude of as… … Hartnacks Eye-piece Micrometer. vertical lines are crossed by two parallel lines, at a distancefrom each other of five divisions of the vertical scale; and theparallelogram thus formed is crossed by a diagonal. It is obviousfrom this construction, that the lengths of the lower segments ofthe 50…
Microscopy · Biology
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