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THE INITIAL ADJUSTMENTS OF VERTICAL VARIOMETERS *
Author(s) -
BRUCKSHAW J. M.
Publication year - 1953
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1953.tb01146.x
Subject(s) - azimuth , tripod (photography) , geodesy , geology , rotation (mathematics) , gemology , meridian (astronomy) , misorientation , geometry , mathematics , optics , seismology , physics , engineering geology , materials science , microstructure , astronomy , grain boundary , metallurgy , volcanism , tectonics
A bstract Using a comprehensive theory of the vertical force variometer, it is shown that the mean of the two readings taken in azimuths 180 degrees apart only eliminates the error of misorientation and of inclination of the knife edge if these factors are sufficiently small. The necessary accuracy in the 180 degree rotation and in the readjustment of the levels are investigated and a practical test is developed to allow the initial adjustments to be determined. Finally, a brief description of a new variometer tripod is given.