The measurement of gravity or gravitational acceleration, esp. as used in
geophysics and geodesy. AGI
The mutual attraction between two masses. See also:law of gravitation
AGI
The constant, gamma , in the law of universal gravitation. Its value is
6.672 X 10-11 m3 /kg X s2 . AGI
A geophysical prospecting method that measures irregularities or anomalies
in gravity attraction produced by differences in the densities of rock
formations, and interprets the results in terms of lithology and
structure. Nelson
A method of geophysical prospecting, that embraces the mapping of
variations in the Earth's gravitational field. See also:gravimeter
Hammond
a. The force by which substances are attracted to each other, or fall to
Earth. See also:law of gravitation
b. The effect on any body in the universe of the inverse-square-law
attraction between it and all other bodies and of any centrifugal force
that may act on the body because of its motion in an orbit. AGI
c. The force exerted by the Earth and by its rotation on unit mass, or the
acceleration imparted to a freely falling body in the absence of
frictional forces. AGI
d. A general term for API gravity or Baume gravity of crude oil.
AGI
The difference between the observed value of gravity at a point and the
theoretically calculated value. It is based on a simple gravity model,
usually modified in accordance with some generalized hypothesis of
variation in subsurface density as related to surface topography.
AGI
Sensitive weighing system in which a beam rides on a fulcrum, and supports
a load of unknown weight at one end which is counterbalanced by known
weights at the other end. Pryor, 3
A 5 ft (1.5 m) length of heavy half-round rod forming the link between the
wedge-orienting coupling and the drill-rod swivel coupling on an assembled
Thompson retrievable borehole-deflecting wedge. Long
See:grizzly
The grading of ores into different sorts and the separation of waste from
coal by the difference in the specific gravity of the minerals to be
separated. Stoces
Separating grains of minerals by a concentration method operating by
virtue of the differences in density of various minerals; the greater the
difference in density between two minerals, the more easily they can be
separated by gravity methods. The laws of free and hindered settling are
important in the theory of gravity concentration. Newton, 1
Continuous belt, system of rollers, or inclined chute down which loaded
material gravitates without the application of power.
See also:roller conveyor; wheel conveyor. Pryor, 3
a. A sampling device capable of working even under moderately adverse sea
conditions. The corer weighs about 650 lb (294 kg) in air and consists
essentially of a shaft, weights, and coring tube. Hunt
b. An oceanographic corer that penetrates the ocean floor solely by its
own weight. It is less efficient than a piston corer. There are several
varieties, including the Phleger corer and the free corer. AGI
gravity-discharge conveyor elevator
A type of conveyor using gravity-discharge buckets attached between two
endless chains and which operate in suitable troughs and casings in
horizontal, inclined, and vertical paths over suitable drive, corner, and
takeup terminals. Syn:bucket elevator
See:V-bucket conveyor elevator
gravity-discharge conveyor-elevator bucket
An elevator bucket designed to contain material on vertical lifts and
scrape material along a trough on horizontal runs. Discharge is effected
by gravity.
See:normal fault
Applicable when the weight of the drill rods is great enough to impose an
adequate pressure on a bit to make it cut properly. Long
An instrument for measuring the gradient of gravity. AGI