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References

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  1. Hartmann. La Nature, January8, 1898.
  2. Glazebrook. Dict. Applied Physics, 3, p. 369.
  3. Proceedings. Institution Mechanical Engineers, Apr.1913.
  4. By the J. T. Slocomb Co., Providence, R. I.

Other (4)

Hartmann. La Nature, January8, 1898.

Glazebrook. Dict. Applied Physics, 3, p. 369.

Proceedings. Institution Mechanical Engineers, Apr.1913.

By the J. T. Slocomb Co., Providence, R. I.

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Figures (2)

F. 1
F. 1

Sketch of micrometer. The diameter of the ring is reduced in size relative to the other parts of the apparatus. A micrometer head; B anvil; C contact lever; D contacts; E contact lever spring; FF′ guides; M motor and gearing.

F. 2
F. 2

Photogragh of micrometer.

Tables (3)

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Table 1 Data showing thirty-six consecutive settings on an end standard made in a period of half an hour

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Table 2 The difference in length of three end standards Nos. 291, 292, and 293. The numbers of the end standards are their nominal lengths in millimeters.

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Table 3 Results of ten measurements of the difference in length of two end standards after the spherical ends were polished. Each difference given is the result of a single independent measurement. No observations were rejected.