Geometrical instrument

Details Geometrical instrument Geometrical instrument

1977-12-30

1979-07-03

Haroian, Harry N.

Geometrical instruments

Straightedge type

33432, 33494, B43L 1314

Patent

active

041595718

ABSTRACT:
A device having two scales, one for vertical height and one for vanishing point distance, that permits perspective drawings to be made without the need for the actual plotting of the vanishing points; and that permits vanishing points of any distance apart to be used in any size drawing. These two scales are mathematically related and are linear in graduation with said graduation being of any convenient size or nomenclature as long as the relationship between the two scales is maintained.

REFERENCES:
patent: 410050 (1889-08-01), Varley
patent: 1986506 (1935-01-01), Harris

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