. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 150 WORZEL AND HARRISON [chap. 9 should be recorded directly in digital form on punched paper tape and com- puted on a high-speed computer using numerical rather than analogue filters. F. Reduction of Observations and Methods of Interpretation The instruments described above yield a gravity value on the moving ship or submarine. Coriolis force due to the vessel's motion on the rotating earth alters the observed value of gravity and means that a correction—the Eotvos correction—must be applied to the observed value to reduc
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 150 WORZEL AND HARRISON [chap. 9 should be recorded directly in digital form on punched paper tape and com- puted on a high-speed computer using numerical rather than analogue filters. F. Reduction of Observations and Methods of Interpretation The instruments described above yield a gravity value on the moving ship or submarine. Coriolis force due to the vessel's motion on the rotating earth alters the observed value of gravity and means that a correction—the Eotvos correction—must be applied to the observed value to reduce it to that A\hich would have been measured on a stationary vessel. The correction to be added to the observed gravity value is given (Worzel, 1959) by the formula: hg = 1 ASlS sin C cos (p + {S^124). G is the true course made good, rp the latitude and S the shij)'s speed in knots. 0ENSITY= 250 mgal 200 150 - 100 50 -50. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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