Education and demonstration – Visual art or craft – artistic adornment – or color training... – Drawing
Patent
1986-02-20
1987-08-25
Grieb, William H.
Education and demonstration
Visual art or craft, artistic adornment, or color training...
Drawing
434 90, 33 1K, G09B 1100
Patent
active
046890173
ABSTRACT:
A drawing aid for use in making drawings in perspective, having at least one transparent chart unit with proper angle, distance and height scales needed for making drawings in perspective. A drawback of known drawing aids of this kind is that they have been provided with scales which are exceedingly difficult to read and that, in the course of drawing, auxiliary lines are invariably produced which clutter up the drawing. The chart unit of the invention has a first chart corresponding to the horizontal plane and marked with radial angles and arcs corresponding to distance, a second chart corresponding to the vertical plane and marked with radial angles and vertical lines corresponding to distance, and an image plane chart corresponding to the image plane, the latter usually serving as a drawing substrate with coordinates consistent with the angle scales of the first and second charts.
REFERENCES:
patent: 1618164 (1927-02-01), Birker
patent: 1964197 (1934-06-01), Edison
patent: 2487690 (1949-11-01), Black et al.
patent: 3086296 (1963-04-01), Bergstrom
patent: 3493727 (1970-02-01), Hosokawa et al.
patent: 3660903 (1972-05-01), Caperton, Jr.
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