Geometrical instruments – Straightedge type – Rules
Patent
1998-04-10
2000-12-12
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Rules
33 1B, 33563, 33483, D10 64, B43L 700
Patent
active
061581356
ABSTRACT:
A see-thru engineering instrument has markings defining sets of longitudinal reference lines along its length. The reference lines are disposed inwardly of the side edges, and define segmentation patterns distinct to each set, distinguishing lines of the respective sets from each other. Lines of respective sets are preferably interposed each between respective lines of ones of another set or sets. Line segments in a single instrument, of the like illustrated, can define discrete measurable distances of any one, up to all, of 1/16, 1/8, 3/16, 1/4, 1/2, 3/4, 13/16, 7/8 and 15/16 inch. The back surface of the instrument preferably has a matte finish. The width of the instrument is greater than 3 inches, preferably about 4 inches. The length is greater than 12 inches, preferably about 13 inches. The thickness is preferably about 1/16 inch. The length/width ratio is at least 2/1. The markings on the instrument can include a grid of squares, marked over less than 2/3 of the overall area. The instrument can include at least 4 different scales. In some embodiments, at least one marking line extends at an angle of 45 degrees, or other angle, to one of the side edges. A protractor, having an origin associated with a side edge can be included. Generally, the markings are disposed closer to the back surface than to the front surface.
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"Transparule Ruling Devices" Class 33 Subclass 493, Dec. 1946.
Fulton Christopher W.
Wilhelm Thomas D.
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