Variable perspective viewing device

Details Variable perspective viewing device Variable perspective viewing device

1991-06-05

1992-03-31

Haroian, Harry N.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33DIG9, 33 1K, 33565, B43L 706

Patent

active

050995820

ABSTRACT:
A device (10) for use by artists, draftsmen and the like for aid in perspective viewing. The device comprises first (11) and second (12) framework units, which when moved with respect to one another form a variable dimension rectangular aperture to vary the field of view of the user.

REFERENCES:
patent: 1976278 (1934-10-01), Cook
patent: 2193518 (1940-03-01), Lubin
patent: 2342525 (1944-02-01), Berry
patent: 2463163 (1949-03-01), Dubner
patent: 3096587 (1963-07-01), Kenney
patent: 4498238 (1985-02-01), Vaughn
patent: 4584779 (1986-04-01), Wakamatsu

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