Top reading rule using blades with directional arrows

Details Top reading rule using blades with directional arrows Top reading rule using blades with directional arrows

1984-06-29

1986-03-11

Little, Willis

Geometrical instruments

Area integrators

Electrical

G01B 310

Patent

active

045744866

ABSTRACT:
A top reading rule has a coilable blade with measuring indicia on both surfaces thereof. On its surface visible through the top reading window, the measuring indicia are offset from the outer end thereof and includes a longitudinally extending central band of a color distinct from the background and directional pointers spaced along the length of the band of a color distinct from that of the band. The pointers indicate the direction of increasing numbers so that a user may readily determine the length represented by graduations intermediate the numbers.

REFERENCES:
patent: 868905 (1907-10-01), Besse
patent: 1926581 (1933-09-01), Clarke
patent: 2347273 (1944-04-01), Lyle
patent: 3004346 (1961-10-01), Quenot
patent: 3255531 (1966-06-01), Anderson
patent: 3375590 (1968-04-01), Quenot
patent: 3426435 (1969-02-01), Ballard et al.

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