Borehole survey instrument control circuitry

Details Borehole survey instrument control circuitry Borehole survey instrument control circuitry

1982-12-03

1984-11-06

Stearns, Richard R.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33313, E21B 47022

Patent

active

044803915

ABSTRACT:
A borehole survey instrument and control circuitry are described. The borehole survey instrument includes indicators for measuring angle of deviation from the vertical and angle of deviation from magnetic north and a photographic recording means for recording the output of the indicators at selected times. A lighting system is utilized in conjunction with the photographic recording means to expose photographic film and a novel time control circuit is utilized in conjunction with the lighting system to alter the length of time of illumination in accordance with the operativeness of individual bulbs within the lighting system. In this manner, the failure of one or more bulbs within the lighting system will not substantially affect the amount of illumination to which the film in the photographic recording means is exposed.

REFERENCES:
patent: 2093128 (1937-09-01), Hewitt, Jr. et al.
patent: 2116350 (1938-05-01), Hewitt, Jr.
patent: 2120670 (1938-06-01), Hyer
patent: 2195224 (1940-03-01), Opocensky
patent: 2644242 (1953-07-01), Hewitt, Jr.
patent: 2756511 (1956-07-01), Young
patent: 4393598 (1983-07-01), Powell et al.

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