Comparison of the Graf sea gravimeter with the Vening Meinesz apparatus on board the submarineU.S.S. Becuna |
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| Authors: | J L Worzel and A Graf |
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| Institution: | (1) Lamont Geological Observatory, (Columbia University), Palisades, New York |
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| Abstract: | Measurements of gravity were made on boardU.S.S. Becuna (SS 319) with a Vening Meinesz pendulum apparatus and a Graf sea gravimeter at approximately the same time.
Comparison of data uncorrected for depth of submergence, E?tvos correction and second order effects of horizontal acceleration
showed that there was a change related to time of observation. These corrections were not made as they would be the same for
both sets of observations, and no provision had yet been made to take care of the horizontal accelerations for the Graf sea
gravimeter. The variation with otime could be caused by instrumental drift or scale calibration. After removal of this effect
by visually fitting the data trend with a straight line, there were three observations with large discrepancies, seventeen
with discrepancies of 3–9 mgal and thirty-nine with discrepancies of 0–3 mgal, showing close approach to a statistical distribution.
The three large discrepancies may be dismissed because of very bad depth control during the observations. The discrepancies
3–9 mgals are larger than expected and perhaps are attributable to depth control and inadequate observation time for the Graf
sea gravimeter.
It is concluded that the Graf sea gravimeter shows great promise for use on a submarine. An apparatus to take into account
the horizontal acceleration effects must be added, and suitable drift characteristic obtained. Despite its advantages of ruggedness,
ease of operation, ease of data reduction, reduced size and weight, many more comparisons of the Graf sea gravimeter with
the Vening Meinesz pendulum equipment should be made before the latter are displaced
Probably the Graf sea gravimeter will be usable on a stable platform on a surface vessel at least in calm sea states. |
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