In the seismic reflection method, a special type of multiple reflection.
This is the reflection that takes place when the energy traveling upward
from the shot is reflected downward by the base of the weathered zone or
by the Earth's surface. The reflected pulse follows the primary downgoing
pulse by a time interval determined by the depth of the shot below the
weathering (or the free surface) and the velocity of the material above
the shot. For normal shooting depths this interval will range from 0.010
to 0.020 s. Dobrin
The nozzle of a pipe used to convey water for hydraulic mining and for the
purpose of distributing or properly applying and increasing the force of
the water. See also:hydraulic monitor
See:pegmatite
a. A blasting powder consisting of nitroglycerin, sodium nitrate, sulfur,
rosin, and sometimes kieselguhr. Webster 3rd
b. Nitroglycerin absorbed by an inert filler such as kieselguhr.
Pryor, 3
See:nozzleman
a. A temporary support at the face to prevent coal from falling before the
cut is complete. BCI
b. Scot. A sprag; a prop put in the holing of a seam while being undercut.
Fay
An Australian term for a pebble or boulder; esp. one of the wind-polished
or wind-sculptured stones that compose a desert pavement or the lag
gravels of an arid region. It is pronounced with a hard g. AGI
A solute that lowers the surface tension of its solvent tends to
concentrate at the air-liquid interphase, and vice versa. Pryor, 3
A monoclinic mineral, 8[Al(OH)3 ] ; pisolitic; in micalike
crystals, or stalactitic and spheroidal forms; a constituent of bauxite
associated with boehmite and/or diaspore; formed by weathering of igneous
rocks, esp. nepheline syenite; also in veins; a source of aluminum and
synthetic abrasives. In emery deposits formed by thermal or regional
metamorphism of bauxites, gibbsite occurs as an alteration crust on
corundum. Syn:hydrargillite
See:phase rule
A light-colored onyx at Gibraltar. See also:Mexican onyx
a. An aluminosilicate of magnesium and potassium, sometimes with
appreciable FeO. Hey, 1
b. Green fine-grained micaceous alteration of nepheline.
An orthorhombic mineral, Pb13 (Cu,Ag)(Bi,Sb)9 S28 (?);
forms soft, metallic, needles on galena associated with pyrite, rutile,
and tennantite; near Giessen in the Binn valley, Valais, Switzerland.
a. A mine cage or skip. CTD
b. Gravity or self-acting haulage. Also called ginney. Mason
The unit of magnetomotive force in the electromagnetic system, equal to
the magnetomotive force of a closed loop of one turn in which there is a
current of 1/(4pi ) abamp. McGraw-Hill, 1
To wash over or overlay thinly with gold; coat with gold, either in leaf
or powder, or by electroplating; as, to gild a chandelier. To overlay with
any other substance for the purpose of giving the appearance of gold.
Standard, 2
A tetragonal mineral, BaFeSi4 O10 ; vitreous; red;
translucent; associated with sanbornite, celsian, taramellite, and
witherite at Dry Delta, AK, and Fresno and Mariposa Counties, CA.
Used for tempering and hardening of drill bits at the mine.
Syn:automatic heat-treating machine
See:uintaite
A device used in faceting gems; a piece of wood containing a series of
holes into which a dop stick (gem stick) can be fixed at various angles,
thus regulating the angle of the facet being cut. Syn:jamb stick
a. A pump worked by a windlass. Standard, 2
b. A pile-driving machine. Standard, 2
c. A drum framework and pulleys for hoisting mineral from a shallow shaft.
CTD
d. Horse gear for hoisting through a mine shaft. Pryor, 3
e. A small, hand-cranked hoist. Long
f. Eng. A drum and framework carrying pulleys, by which the ore and waste
are raised from a shallow pit; a whim. Also called horse gin. A
contraction of engine. Fay
g. An old form of hoisting engine. Mason