US Patent: 51,967
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Improvement in Compasses and Calipers
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Patentees:
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Frank P. Pfleghar (exact or similar names) - New Haven, CT |
William Schollhorn (exact or similar names) - New Haven, CT |
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Patent Dates:
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Granted: |
Jan. 09, 1866 |
Patent Pictures:
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Ralph Brendler
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Description: |
This design uses a tapered thumbscrew to lock the arm in place against a direct-reading scale.
Note that one of the witnesses here holds a previous caliper patent (John Earle: 19,058 - 1/05/1858). |
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