Drawing board
AssigneeColin Ward Rogers
InventorJoseph Smith
Life of this patent
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Abstract
A drawing board suitable for use in preparing perspective drawings is provided with a pair of arcuate guide surfaces facing towards one another and situated towards one side of the drawing board, with a recess or depression between the arcuate guide surfaces, so that a drawing instrument having projections capable of engaging the arcuate guide surfaces, can be readily moved from one arcuate guide surface to the other to enable the drawing instrument to point towards vanishing points on either side of the drawing board. The drawing board may have straight guide edges, as well as additional arcuate guide edges, one of which may be directed towards a central vanishing point. The multi-purpose board can be used to produce various types of perspective drawings and seven vanishing points are shown.
Claims9
A drawing board having a drawing surface and guide means for drawing instruments which guide means do not protrude above the plane of the drawing surface, said guide means including a pair of arcuate guide means of opposite curvature situated on one side of the board each arcuate guide means defining a different vanishing point with said vanishing points disposed on opposite sides of the center of the drawing surface, and a recess between the arcuate guide means to enable a drawing instrument positioned partly within said recess to be moved from one arcuate guide means to the other to enable lines to be drawn towards the different vanishing points on opposite sides of the center of the drawing surface, said arcuate guide means that is closest to the adjacent edge of the board being of larger radius, and being longer than the other said arcuate guide means.
Dependencies are inferred from the claim text.