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2
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to the longitudinal edges thereof, bolts
adapted to pass through the outermost per-
forations and the slot, and nuts on said
bolts for rigidly connecting the blades in
5 perpendicular relation.
2. A square comprising a blade having a
series of perforations at one end arranged
transversely of the blade in a line perpen-
dicular to the longitudinal edges of the
10 blade, one of said openings being located
centrally with respect to the others, a scale
being formed on one side of said blade
partly surrounding said central opening,
the markings of said scale being tangential
15 to said central opening, a second blade hav-
ing a central longitudinal slot therein, a
bolt adapted to be passed through one of
said perforations in the first named blade
and through the slot in the second blade to
permit the latter blade to swing and be
adjusted at various angles to the first blade,
a thumb nut for said bolt, and a second
bolt with thumb nut adapted to pass
through another of said perforations and
the slot to lock the blades when they have
been arranged perpendicular to each other.
In testimony whereof I affix my signature
in presence of ,two witnesses.
SAMUEL D. FRAZIER.
Witnesses:
A. WILDENTHAL,
W. T. GARDNER.
2)
Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,
Washington, D. C."