Method and apparatus for surveying clearances on railway tracks

Details Method and apparatus for surveying clearances on railway tracks Method and apparatus for surveying clearances on railway tracks

1975-06-27

1978-11-07

Corbin, John K.

Optics: measuring and testing

By configuration comparison

With object being compared and scale superimposed

33 1Q, 350 10, 356 21, 356394, G01B 1124

Patent

active

041242998

ABSTRACT:
A method of comparing circumferential shapes, particularly the outer circumference of a desired clearance wth the real clearance between obstacles arranged alongside a railway track, for example, signalling posts, overhead structures and quay walls, wherein from a point on the railway track, with the aid of field-glasses, in the viewing field of which is arranged an image of the outer circumference of the desired clearance made from a given distance, the real clearance is observed in the direction of length of the track at said given distance.

REFERENCES:
patent: 2674152 (1954-04-01), Wilkinson
patent: 2942345 (1960-06-01), Goldberg
patent: 3695769 (1972-10-01), Mason

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