US Patent: 857,810
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Micrometer-Gage
Hole Micrometer
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Patentee:
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| George Kohlhaas (exact or similar names) - Washington, DC |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 06, 1904 |
| Granted: |
Jun. 25, 1907 |
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Ralph Brendler
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Description: |
| This is a typical hole mic, used to accurately measure bored holes and tubes. The patented features here are a slightly different method of actuating the measuring rods, and an extra-long handle to allow it to measure the hole at a significant depth to determine if it tapers. |
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