Transparent measuring device with multicolored lines

Details Transparent measuring device with multicolored lines Transparent measuring device with multicolored lines

1986-11-19

1988-10-25

Haroian, Harry N.

Geometrical instruments

Miscellaneous

Light direction

33 11, 33494, 33476, B43L 700

Patent

active

047793465

ABSTRACT:
A measuring device (10) formed from a rectangular sheet (11) of transparent material having a pattern of composite vertical lines (16) and composite horizontal lines (18) that form squares (20). Each composite line is formed of a first line (24) of a first color and a second line (26) of a second color different than the first color, such that the composite line will be visible against backgrounds of various colors. The first line is preferably of a lesser breadth than the second line, and is superimposed on the second line so that second line is visible on each side of the first line, and either line will be visible against a multicolored background. The composite lines may be consecutively numbered with numbers (28), and single colored angled lines (22) may be provided having markings (32) representing the angle in degrees that each angled line makes with the vertical lines.

REFERENCES:
patent: 647339 (1900-04-01), Thompson
patent: 846006 (1907-03-01), Bryson
patent: 1423019 (1922-07-01), Pogue
patent: 2095543 (1937-10-01), Zachs

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