Direct reading grade rod with a sliding scale

Details Direct reading grade rod with a sliding scale Direct reading grade rod with a sliding scale

1983-05-25

1984-09-18

Little, Willis

Geometrical instruments

Straight-line light ray type

Rod or target

33294, 33161, G01C 1500

Patent

active

044715323

ABSTRACT:
A direct reading grade rod as provided with a fixed scale having display windows therein and one or more sliding members slidable behind the fixed member and carrying a plurality of number sets, with different positions of the sliding member resulting in different sequences of numbers displayed in the windows.

REFERENCES:
patent: 287021 (1883-10-01), Gurley
patent: 360836 (1887-04-01), Wright
patent: 637501 (1899-11-01), Classon
patent: 716006 (1902-12-01), Doak
patent: 828166 (1906-08-01), Wiswall
patent: 905441 (1908-12-01), Lenker
patent: 1220358 (1917-03-01), Martin
patent: 2017346 (1935-10-01), Linn
patent: 3492729 (1970-02-01), Crain
patent: 4060909 (1977-12-01), Collins et al.

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