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US Patent: 79,052
Improvement in Carpenters' Gauges
Curve Marking Gage
Patentee:
Arlon Henry Blaisdell - Newton Corners, MA

USPTO Classifications:
33/42, 33/43

Tool Categories:
layout tools : marking gauges
layout tools : marking gauges : curve marking gauges

Assignees:
None

Manufacturer:
Unknown

Witnesses:
F. A. Potter
S. W. Trowbridge
W. G. Ashkettle
Wm. A. Morgan

Patent Dates:
Granted: Jun. 23, 1868

Patent Pictures: [ 1 | 2 | 3 ]
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Description:
Ah, the Blaisdell's Patent Gage-- this one is a classic not so much for its utility, but rather for its sheer "gizmocity". This gage uses a complicated series of cams and sliding bars to create a gage that can mark off any convex or concave curved edge. Once you figure out exactly how to set it up it actually works pretty well, but this design is way too complicated for the task it was designed to do.

The example shown in the photograph is especially unusual, as it has a pencil-holder on the end of the arm. It is obviously original, but I have never seen another with htis feature.

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