Back in the days before
pre-hung doors, carpenters had to insert the door jambs and cut mortises to
accept the hinge plates on both the door edge and the jamb. The width of the mortise was referred to as
the “gain” and butt gauges were specially designed to quickly transfer and
scribe the gain onto both door and jamb, as well as to transfer and scribe the
hinge leaf thickness.
This particular butt
gauge was manufactured by the Millers Falls Tool Company. The Stanley one was nicer.
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