Designer's triangle

Details Designer's triangle Designer's triangle

1983-08-22

1985-10-08

Haroian, Harry N.

Geometrical instruments

Straightedge type

Plural straightedges nonadjustably fixed at right angles

33482, B43L 1300

Patent

active

045451303

ABSTRACT:
A designer's triangle which permits completion of a drawing with the use of a single instrument includes a planar sheet having three external edges forming a triangle with angles of 45.degree., 60.degree. and 75.degree., respectively. The planar sheet defines three-sided first and second internal triangular cutout openings having respective edges lying along perpendiculars to edges of the external triangle and a trisector of the 45.degree. angle. In some preferred embodiments these perpendiculars intersect at a common point and may constitute altitudes of the external triangle.

REFERENCES:
patent: 777407 (1904-12-01), Early
patent: 2043729 (1936-06-01), Bilder
patent: 2080620 (1937-05-01), Martin

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