Drawings aid for making drawings in perspective

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.

Dependencies are inferred from the claim text.