Fall flat down on the floor. In the early days of coal mining, igniting
the gas was a very common thing; so, whenever an explosion took place, the
colliers shouted to one another, "Squat, lads!" Fay
A shot that breaks the coal only enough to allow the gases of detonation
to escape with a whistling or squealing sound; also called a whistler.
Zern
Arkansas. See:seam-out; squealer.
Arkansas. Seamy coal from which the powder gases escape with a squealing
sound. Fay
a. A crushing of coal or other materials with the roof moving nearer to
the floor, due to the weight of the overlying strata. Lewis
b. The settling, without breaking, of a mine roof over a considerable area
of workings. Also called creep; crush; pinch; nip.
c. The effect of the closure of stope walls on supports placed between
them. Spalding
d. A passageway in a cave that is very narrow and can be passed by a
person only with great difficulty. AGI
e. Applied to sections in coal seams where they have become constricted by
the squeezing in of the overlying or underlying rock as a result of
pressure during folding or other movements. AGI
f. A pinch of a vein in passing through hard bands of rock. Gordon
g. To inject a grout into a borehole under high pressure. Long
h. The plastic movement of a soft rock in the walls of a borehole or mine
working that reduces the diameter of the opening. Long
i. Pumping cement back of casing under high pressure to block off or
re-cement channeled areas. Wheeler, R.R.
j. The rapid or gradual closing of a mine working by the displacement of
weak floor strata from beneath supporting pillars into adjacent mine
rooms. See also:want
A mine tub controller that acts by squeezing the tub or the wheels.
Mason
A single-stroke, compressed-air cylinder for closing rivets through the
medium of a toggle mechanism. Hammond
The slow increase in weight on pillars or solid coal eventually resulting
in such things as crushing of the coal, heaving of the bottom, and the
driving of pillars into soft floor or top. The cause normally is leaving
pillars or other supports which, after considerable area is opened up,
prove to be inadequate, permitting the top to settle gradually with
transfer of the weight to active places and solid coal.
Coal Age, 3
a. See:electric squib
b. A thin tube filled with black powder, forming a slow-burning fuse to
explode a stemmed charge of black powder. BS, 12
c. A small charge of powder exploded in the bottom of a drill hole, to
spring the rock, after which a heavy shot is fired. A springing shot.
d. In well boring, a vessel, containing the explosive and fitted with a
time fuse, that is lowered into a well to detonate the nitroglycerin
charge.
e. A firing device that will burn with a flash which will ignite black
powder. Nichols, 1
A blast with a small quantity of high explosives fired at some point in a
borehole for the purpose of dislodging some foreign material that has
fallen into it. Fay
Derb. A mineral vein cut by a dike and thereby thrown out of alinement on
the two sides of the dike. Arkell
A centrifugal blower with forward-curved blades. Strock, 2
An alternating current electric motor with many applications. The rotor is
made of strong parallel copper or aluminum bars on the perimeter, joined
to end rings of the same metal. Hammond
A stage in the heating of clay when so much of the material has fused that
the mass begins to lose its shape and becomes viscous.
See also:fusion of clay; vitrifying. Nelson
a. To guide a pipe, casing, or drill rod so that the threads will engage
properly. Long
b. To recover a drill tool lost in a borehole by using a spear-shaped or
pointed fishing tool. Long
c. In adding to a drill string, the action of lining up and catching the
threads of the loose piece. Nichols, 1
a. The resistance of a structure, slope, or embankment to failure by
sliding or collapsing under normal conditions for which it was designed;
e.g., bank stability and slope stability.
See also:bank slope stability
b. In thermodynamics, an equilibrium state to which a system will tend to
move from any other state under the same external conditions. AGI
A grouping of minerals arranged according to their persistence in nature;
i.e., to their resistance to alteration or destruction by weathering,
abrasion during transportation, and postdepositional solution; e.g.,
olivine (least stable), augite, hornblende, biotite (most stable). The
most stable minerals are those that tend to be at equilibrium at the
Earth's surface. Syn:order of persistence
A rod coupling built up to reaming-shell size by welding on an
abrasion-resistant metal, applied in ridges parallel to the long axis of
the drill rod. Long
a. A hardened, splined bushing, sometimes freely rotating, slightly larger
than the outer diameter of a core barrel. Also called ferrule; fluted
coupling. Long
b. A misnomer for guide rod. Long
c. Any powdered or liquid additive used as an agent in soil stabilization.
See also:processing
a. Not readily decomposed or deformed. CF:unstable
b. A short drivage, room, or space excavated at the end of a longwall face
to accommodate a coal cutter or cutter loader. The stable provides room
for turning the machine where this is necessary, and also exposes a
buttock for the machine to start its cut across the face. Nelson