Geometrical instruments – Miscellaneous – Light direction
Patent
1988-06-10
1990-04-03
Haroian, Harry N.
Geometrical instruments
Miscellaneous
Light direction
33565, 434 88, G09F 1118
Patent
active
049128493
ABSTRACT:
A tracing instrument for producing symmetrical sketches includes a transparent or translucent base plate, an illuminating source for projecting light through the base plate, and a transparent top plate disposed on an opposite side of the base plate from the illuminating source, and being spaced apart from the base plate such that a narrow space is formed therebetween, and wherein the top plate forms a surface to support a tracing paper or the like for tracing thereon. Further, a mounting piece is provided which has at least a window therein and is insertable in the narrow space between the base plate and the top plate, wherein a seed drawing is positioned at the window such that light from the illuminating source passes through the window and seed drawing to form an image on the tracing paper for tracing. Also, a shifter is provided for shifting the mounting piece with respect to the tracing paper such that the image is projected onto different portions of the paper.
REFERENCES:
patent: 160287 (1875-03-01), Shepherd
patent: 1559665 (1925-11-01), Beery et al.
patent: 2918732 (1959-12-01), Ortega
patent: 3568327 (1971-03-01), Furuoka
patent: 4251920 (1981-02-01), Cassagnes
patent: 4427387 (1984-01-01), Tomita
patent: 4600393 (1986-07-01), Rosenwinkel
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