Geometrical instruments – Miscellaneous – Light direction
Patent
1982-05-25
1985-03-19
Martin, Jr., William D.
Geometrical instruments
Miscellaneous
Light direction
33 1B, 33432, 33476, B43L 1314
Patent
active
045050414
ABSTRACT:
A drafting template having printed thereon a pattern of non-concentric elliptical portions, preferably forming complete ellipses, a vertical measuring line extending upwardly from a common point for the pattern or from a base point for the vertical measuring line, and a horizon line mounted at a scaled height above the base point and being parallel to the major axes of the elliptical portions or ellipses. The pattern is a perspective view of concentric circles or portions thereof taken at a scaled distant station point and scaled height above the plane for the circles. The horizon line is mounted at a scaled height above the base point. By selecting one or more vanishing points on the horizon (line), and drawing lines on an overlaying drafting sheet correlated to the base point between the vanishing point(s) and base point, such drawing lines intersecting the elliptical portions or ellipses, a lined grid field can be ultimately produced on the drafting sheet. It is from this grid field that a visually accurate perspective view of an area can be structured. A wide variety of series of templates including different scales and different values for the parameters of the template can be produced.
REFERENCES:
patent: 1723517 (1929-08-01), McFadden
patent: 2933818 (1960-04-01), Palmer
patent: 3358916 (1967-12-01), Suto
Graphic Indicator Co. Inc., Third Edition, Cassel Perspective Indicator Work Sheet #42 Undated.
Martin, Jr. William D.
Zugelter Frank L.
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