Drawing instruments

Details Drawing instruments Drawing instruments

1987-03-16

1989-04-11

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

33482, 33479, B43I 1302

Patent

active

048193380

ABSTRACT:
A drawing board and drawing instrument combination is provided. The drawing board has grooves along three of its edges and at 45.degree. across the corners which can receive tongues provided on either side of a flat drawing instrument. The instrument has a number of straight edges which overlie the board in use and which make different angles to the edge of the board. The instrument serves as a T-square and also as a set-square, and is reversible.

REFERENCES:
patent: 1682035 (1928-08-01), Clark
patent: 2219766 (1940-10-01), Cotterman
patent: 2247362 (1941-07-01), Dibble
patent: 3589016 (1971-06-01), Hebel

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