Maintenance machines for railway track

Details Maintenance machines for railway track Maintenance machines for railway track

1976-05-04

1978-01-03

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Alignment device

404 84, 104 7R, E01B 2904

Patent

active

040658562

ABSTRACT:
An optical system for establishing a reference datum in relation to which operations can be carried out in roadway workings comprises optical devices which define an optical triangle whose plane inclines downwardly towards the plane of the roadway. The inclination of the plane of the optical triangle is adjustable so that a corner of the triangle is set at the level of the roadway as determined by a reflected image of the roadway surface.

REFERENCES:
patent: 3381626 (1968-05-01), Fagan et al.

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