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US Patent: 495,379
Micrometer Gage
John Ciceri Smith - Edinburgh, Mid-Lothian, Scotland

USPTO Classifications:

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


Not known to have been produced

Edmond Brown
John Jelly
F. B. Keefer
Ewell Akin

Patent Dates:
Applied: Dec. 08, 1891
Granted: Apr. 11, 1893

Patent Pictures:
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Walker Bailey - patent attorney

This patent was acquired by the Brown & Sharpe Mfg. Co., Providence, R. I., but was never produced by them.

This invention has reference to micrometer gages for gaging wire, rods, plates and other articles. With these gages as at present made it is very difficult to see what is the gage or thickness of the article that has been gaged in the instrument because the indications or scales are so small and indistinct, particularly in what is known as the decimal gage which measures to the thousandth of an inch, and therefore the object of my said invention is to make these gages readable by combining therewith or adding thereto any suitable counter which is connected with the micrometer screw or other moving part of the instrument in such a manner that the said counter is worked by the movement of the screw or other part when the instrument is manipulated, and which when being manipulated so as to reduce the gage works the counter backward, and when manipulated so as to increase the gage works the counter forward. This invention may also be applied on a larger scale for measuring lengths and diameters of spindles, inside of bushes, and any other parts of machinery requiring very accurate measurement for fitting purposes. One advantage is the simplicity of transferring these measurements to paper for the purpose of transmitting orders by post, and as this may be adjusted to the metric as well as the British standard the advantage would be considerable from an international standpoint.

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