Ruler

Details Ruler Ruler

1986-06-27

1987-02-10

Little, Willis

Geometrical instruments

Straightedge type

Rules

33494, 33 1B, G01B 302

Patent

active

046414363

ABSTRACT:
A transparent ruler with a U-shaped slot, a multiplicity of separate scales, and reference numbers. The scales are exactly perpendicular to each other, with one being horizontal and the others being vertical. Three slots are on the ruler, two of which are parallel with the vertical scales and one of which is parallel to the horizontal scale. The slots intersect so as to form one big square U-shaped slot. There are arrows on the top and side edges of the ruler which are collinear with the slots. These arrows are used for reference purposes when extending a line, squaring a line with respect to another line, etc. The vertical scales are used to draw perfectly parallel lines with respect to the horizontal slot.

REFERENCES:
patent: 1544327 (1925-06-01), Loewenthal
patent: 2722055 (1955-11-01), Rader
patent: 4171573 (1979-10-01), Picciotto
patent: 4221057 (1980-09-01), Luikart
patent: 4565012 (1986-01-01), Bilodeau et al.
patent: 4584780 (1986-04-01), Pressey

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