US Patent: 110,657
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| Improvement in Calipers
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Patentee:
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| William P. Hopkins (exact or similar names) - Lawrence, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jan. 03, 1871 |
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Ralph Brendler
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Description: |
| Instead of the normal configuration of a spring forcing the legs apart and a screw holding them together, this design reverses the forces. The inventor claims that this allows the calipers to be used in tighter places. |
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