US Patent: 397,442
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| Micrometer Gage
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Patentee:
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| Charles H. Russom (exact or similar names) - Springfield, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 25, 1888 |
| Granted: |
Feb. 05, 1889 |
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Joel Havens
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Description: |
| The purposes of my invention are, first, to provide a micrometer adapted to measure the fractional parts of an inch divided on the scale of the ordinary carpenter's rule, to wit, one-half, one-quarter, one-eighth, one-sixteenth of an inch, and so on to one sixty fourth of an inch, also one-tenth part of one sixty-fourth of an inch;
second, to provide an improved adjustable nut inclosing the micrometer-screw, and through which said screw works; third, to provide a conical screw thimble of improved construction for clumping the adjustable nut against the micrometer-screw;
fourth, to securely enclose the working parts of the micrometer to protect them from injury;
fifth, to provide an improved means for attaching the micrometer screw to the outer shell of the micrometer, thus attaining more perfect alignment of the parts;
sixth, to provide a convenient and effective means for clamping the micrometer to the micrometer-stand when used as a surface gage, &c.
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