| US Patent: 75,827 
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| Improvement in Calipers | 
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| Patentee: |  |
 | Jearum Atkins (exact or similar names) - Washington, DC |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Granted: | Mar. 24, 1868 |  USPTO (New site tip)
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                        Ralph Brendler
 
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| Description: |  | This caliper joint design features a tapered shaft so that the calipers can be tightened in any position without the tightening moving the legs. |  |