Geometrical instruments – Straightedge type – Rules
Patent
1987-03-09
1987-12-22
Stearns, Richard R.
Geometrical instruments
Straightedge type
Rules
33 1G, B43L 700, G01B 304
Patent
active
047138912
ABSTRACT:
A column marker (10) to be used for marking columns on a book layout sheet (42) comprises an elongated ruler member (12) defining a straightedge (14) and a display surface (16) having unique column-marking indicia thereon. The unique column-marking indicia includes a plurality of sets (18A-G) of three side-to-side adjacent elongated bars (20A, 22A; and 24A; 20R; 22B, and 24B, etc.). The bars are parallel to the straightedge and many of the bars in each set are longer than other bars in the set. The longer bars are positioned further from the straightedge than the shorter bars. First ends (26) of the bars are aligned, while perpendicular tails (28 and 30) at second ends of the longer bars extend to the straightedge beyond ends of the shorter bars (32A-32G). The column marking indicia further includes set-identifying indicia (32A-32G) to indicate the number of columns per page each set is to be used with, and bar-identifying indicia (34) to indicate which bar in each set is to be used for a particular size book page. Each bar in each set has a different color than other bars in that set, but each set has bars with the same color as bars in other sets. The bar-identifying indicia identifies the particular page size each color represents.
REFERENCES:
patent: 1369833 (1921-03-01), Murphy
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patent: 2077828 (1937-04-01), Dombrowski
patent: 2547745 (1951-04-01), Cade et al.
patent: 3968574 (1976-07-01), Ellis
patent: 4221057 (1980-09-01), Luikart
Educational Experiences, Inc.
Stearns Richard R.
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