Measuring equipment for the determination of terrestrial refract

Details Measuring equipment for the determination of terrestrial refract Measuring equipment for the determination of terrestrial refract

1980-05-27

1982-09-07

Myracle, Jerry W.

Measuring and testing

Meteorology

Electric disturbance

33275R, G01W 100

Patent

active

043477399

ABSTRACT:
A measuring arrangement is described for determining the terrestrial refraction in geodetic measurements, (such as trigonometric height transfers when staking out and for precision tachymetry, controlling devices for building machinery using a laser beam, and precision levelling). The measuring arrangement includes a geodetic measuring instrument, an electronic calculator and a device for measuring differences of travel times of soundwaves. After the soundwaves produced by a sound emitter have traversed representative airlayers (for instance at different heights), the time difference is measured and is used for calculating the refraction.

REFERENCES:
patent: 3446559 (1969-05-01), Astheimer et al.
patent: 4031756 (1977-06-01), Rotier et al.
patent: 4112756 (1978-09-01), MacLennan et al.

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