US Patent: 490,860
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| Depth Gage
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 29, 1892 |
| Granted: |
Jan. 31, 1893 |
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Description: |
| This invention has for its object the production of a novel gage by which to readily ascertain the diameter of holes, the instrument as made being also available for use in measuring the depth of a hole or cavity, or the depths of different parts of a hole or cavity of unequal depth. The tool to be described consists essentially of a tapering spindle and a co-operating sliding index provided with suitable scale marks to designate the standard twist drill gage, or to designate fractions of an inch, as for instance, thousandths of an inch, the index containing one or both these scale marks, or it may be any other suitable or desired scale marks.
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