Angle drafting set

Details Angle drafting set Angle drafting set

1990-05-25

1990-12-04

Haroian, Harry N.

Geometrical instruments

Straightedge type

Plural straightedges nonadjustably fixed at right angles

33482, B43L 700

Patent

active

049743309

ABSTRACT:
An improved angle drafting set is provided and consists of a trapezium tool and an angle modifier tool. The trapezium tool is so constructed that a person can accurately draw angles in five degree increments between zero degrees and three hundred and sixty degrees. The angle modifier tool is so constructed that when used in conjunction with the trapezium tool the person can accurately draw angles in whole degree increments between zero degrees and three hundred and sixty degrees with the trapezium tool.

REFERENCES:
patent: 827989 (1906-08-01), Noble
patent: 2532329 (1950-12-01), Premo

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