Geometrical instruments – Miscellaneous – Light direction
Patent
1996-06-21
1998-09-01
Will, Thomas B.
Geometrical instruments
Miscellaneous
Light direction
33432, B43L 1314
Patent
active
057994021
ABSTRACT:
The invention relates to a portable and removable device for positioning and resetting a vanishing point of a perspective drawing which is to be construed on a support. The device comprises at least one stick of a given length and having opposite ends, one of these ends being provided with a transversal pin. The device further comprises a supporting member which can be removably fastened to the support. The supporting member further comprises a device for locking and positioning the stick to the member. The pin at the one end of the stick is positioned at a given distance from the member and used to locate the vanishing point. The device for positioning and locking the stick includes an adjustable abutment adapted to position the stick in a given direction. The abutment is able to remain in such an orientation after removal of the stick and the device for locking and positioning so as to reset the given direction of the stick. The supporting member further comprises a slanted wheel for modifying the distance of the stick from the support where the drawing is to be construed. Thanks to the slanted wheel, the stick may be prevented from contacting the drawing board which is highly desirable when the drawing surface is wet.
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