a. French name for sapropelic coal, such as torbanite or cannel.
Tomkeieff
b. See:cannel coal
The process for the removal of moisture from the blast of an iron blast
furnace by reducing the temperature of the blast current so that the
moisture is deposited as snow. See also:cold blast
Webster 2nd; Fay
When gases react, they do so in volumes that bear a simple ratio to one
another, and to the volumes of their products if these are gaseous,
temperature and pressure remaining constant. Also called law of gaseous
volumes. Cooper
In sulfuric acid making, a tower filled with pieces of coke over which
concentrated sulfuric acid trickles down. On meeting gas issuing from the
lead chambers, the coke absorbs nitrous anhydride, which otherwise would
be lost. CF:Glover's tower
A monoclinic mineral, Na2 Ca(CO3 )2 .5H2 O ;
soft; in flattened and elongated crystals in muds from playa lakes in the
Mohave Desert, CA, and the Gobi Desert, Mongolia.
a. A mobile upwarping of the crust of the Earth, of regional extent. Ant:
geosyncline. AGI
b. More specif., an anticlinal structure that develops in geosynclinal
sediments, due to lateral compression. Var: geoanticline. AGI
a. The moving parts or appliances collectively that constitute some
mechanical whole or set, linked meshing and fitted together, and serving
to transmit motion or change its rate or direction. Commonly used in the
plural. Hess
b. A gear wheel. Hess
c. See:feed gear
d. The accessory tools and equipment required to operate a drill.
Long
e. A set of enmeshing-toothed rotating parts or cogwheels designed to
transmit motion. Long
f. A toothed wheel, cone, or bar. Nichols, 1
A monoclinic mineral, CaAl(OH)F4 .H2 O ; occurs with
fluorite and barite in hydrothermally altered sedimentary and volcanic
rocks.
In beneficiation, smelting, and refining, one who tends a coarse or
primary crusher that breaks large lumps of ore into a smaller size so that
it may be run through smaller crushers or shipped to a plant for
extraction of the valuable metal or minerals. DOT
The relationship between the speeds of the first and last shafts,
respectively, of a train of gears. If a certain force drives a machine at
a given speed and the output shaft runs at one-tenth of the speed of the
input shaft, then the output force will be 10 times the input. If the gear
ratio of a motor-driven machine is 10 to 1, then the turning force of the
last shaft will be 10 times that of the motor, apart from force used up in
friction. Mason
A device that causes one shaft to turn another at reduced speed.
Nichols, 1
A borehole surveying instrument often used to test the verticality of the
freezing holes in shaft sinking. A vernier scale is used to determine the
positions of the pendulum points at successive points, and by summating
the results an accurate plan of the course of the borehole can be
prepared. Nelson
A brittle wine-yellow variety of amber with very little succinic acid;
lacks the toughness and ability to take as high a polish as the succinic
acid-rich varieties; rarely used as a gem except for beads.
Syn:mellow amber
See:zinn
An orthorhombic mineral, (Mg,Fe)5 Al2 [Si6 Al2
O22 ](OH)2 ; amphibole group, with Mg/(Mg + Fe) = 0.1-0.89;
forms series with magnesiogedrite and ferrogedrite; common in schists,
gneisses, and metasomatic rocks.
a. Alluvial material that is not of recent origin lying on the surface. An
example is the sandy region of the North Sea coast in Germany. AGI
b. See:saprolite
A tetragonal mineral, Ca2 Al(AlSi)O7 ; melilite group; forms
a series with akermanite; a common constituent of feldspathoidal rocks
formed by reaction of mafic magmas with carbonate rocks.
Syn:velardenite
a. An ionization chamber that records the number of radioactive particles
impinging upon it per minute, thus detecting radioactive substances.
Bateman, 2
b. An instrument that detects gamma rays given off by radioactive
substances. AGI
c. An ionization chamber with its vacuum and its applied potential so
adjusted that a gamma ray or other ionizing particle passing through it
causes a momentary current to flow. The surge of current can be amplified
and counted so as to measure the intensity of radioactivity in the
vicinity of the chamber. AGI
Geiger-Mue#1.ller counter tube
A gas-filled chamber usually consisting of a hollow cylindrical cathode
and a fine wire anode along its axis. It is operated with a voltage high
enough so that a discharge triggered by a primary ionizing event will
spread over the entire anode until stopped by the reduction of the field
by space charge.
An instrument consisting of a Geiger-Mueller tube plus a voltage source
and the electronic equipment necessary to record the tube's electric
pulses. Also called Geiger counter. AGI
A Geiger-Mueller counter encased in a watertight container, which can be
lowered into a borehole and used to log the intensity of the gamma rays
emitted by the radioactive substances in the rock formations traversed.
Syn:Geiger probe
M( ‹ 6 ”"6 õ¹ä 'DICTIONARY TERMS:Geiger-Mueller tube A radiation detector consisting
[\B]Geiger-Mueller tube[\N]