|US Patent: 106,099|
|Improvement in Adjustable Gauge|
|Not known to have been produced|
||Aug. 02, 1870
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This is a fairly simple and useful design, covering a slotted bar
with an adjustable mortise point, and an unusual head retaining
mechanism. Of interest in this design is that the adjustable
point is the outbound point-- almost all other designs have the
outbound point fixed.
The head locking mechanism is also quite clever, using tension on
a collar around the bar to hold it in place. This would hold
quite firmly without marring the bar.