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The superconducting gravimeter achieves sensitivities of 10 –11 m·s −2 (one nanogal), approximately one trillionth (10 −12) of the Earth surface gravity. In a demonstration of the sensitivity of the superconducting gravimeter, Virtanen (2006), [ 8 ] describes how an instrument at Metsähovi, Finland, detected the gradual increase in ...
Pendulums used in Mendenhall gravimeter apparatus, from 1897 scientific journal. Gravity gradiometry is the study of variations in the Earth's gravity field via measurements of the spatial gradient of gravitational acceleration.
Gravimeter with variant of Repsold pendulum The large increase in gravity measurement accuracy made possible by Kater's pendulum established gravimetry as a regular part of geodesy . To be useful, it was necessary to find the exact location (latitude and longitude) of the 'station' where a gravity measurement was taken, so pendulum measurements ...
Gulf gravimeter: One of the last and most accurate pendulum gravimeters was the apparatus developed in 1929 by the Gulf Research and Development Co. [124] [125] It used two pendulums made of fused quartz, each 10.7 inches (270 mm) in length with a period of 0.89 second, swinging on pyrex knife edge pivots, 180° out of phase. They were mounted ...
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The Lunar Traverse Gravimeter was a lunar science experiment, deployed by astronauts on the lunar surface in 1972 as part of Apollo 17. The goal of the experiment was to use relative gravity measurements to infer potential attributes about the geological substrata near the Apollo 17 landing site.
Theory and Practice of Pendulum Observations at Sea. Part II: Second order corrections, terms of Browne and miscellaneous subjects. Delft. ASIN B001C3VNUA. F.A. Vening Meinesz (1926). Theory and Practice of Pendulum Observations At Sea. Waltman Delft. ASIN B00CTUJOU6. F.A. Vening Meinesz (1941). The Gravity Measuring Cruise of the US Submarine ...
There are at least two types of gradiometer to measure magnetic fields: . Axial gradiometer.This device consists of two magnetometers placed in series (i.e., one above the other).