US Patent: 149,761
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| Improvement in Trammels or Beam-Compasses
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Patentee:
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| Chancy H. Lathrop (exact or similar names) - Jersey City, NJ |
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Patent Dates:
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| Applied: |
Feb. 07, 1874 |
| Granted: |
Apr. 14, 1874 |
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Patent Pictures:
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1 | 2
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Ralph Brendler
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Description: |
| This design for a trammel set features a cam-based locking mechanism that both locks the pencil or point in the head, as well as the head to the bar.
Known examples mark "Pat Appl'd For" on the locking levers. |
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