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US Patent: 397,442
Micrometer Gage
Patentee:
Charles H. Russom (exact or similar names) - Springfield, IL

USPTO Classifications:
33/828

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Daniel O'D. Hallahan
Henry Klaholt

Patent Dates:
Applied: Jun. 25, 1888
Granted: Feb. 05, 1889

Patent Pictures:
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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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