The hole in the lower part of the windbore of a mining pump to admit the
water.
A butterfly valve opening from the cold-blast main of a blast furnace to
the atmosphere. It allows casting at the furnace without shutting down the
blowing engines; operated by large wheel or lever in the cast house.
Fay
Vapor-deposited skeletal ice crystals without a substrate; their
accumulation; used for recreation and as a coolant. See:ice
See:rain gage
a. To increase the height of an undercut by means of explosives or
otherwise. Fay
b. To check descent of a car, by a turn of a rope around a post.
CF:jig chain
c. To check the descent of any object being lowered by hand.
In bituminous coal mining, a laborer who follows in the wake of a
coal-cutting machine as it undercuts the face of coal, and breaks down the
front of the working face above the channel with a pick so that the coal
will drop freely when it is blasted. DOT
a. A term applied by bluestone quarrymen to the process of forcing a cross
break in the absence of an open seam.
b. Increasing the height of an undercut by picking or blasting down the
coal, just above the undercut.
A conveyor in which a snub pulley is used. NEMA, 1
An idler pulley so mounted as to increase the arc of contact between a
belt and a drive pulley. When used in a wrap drive, it has the added
function of changing the direction of the return belt travel.
NEMA, 2
A mechanical sampler consisting of a cast-iron plate revolving in a
vertical plane on a horizontal axis, and having an inclined sample spout
passing through the flange. The ore to be sampled comes to the sampler by
way of an inclined chute and impinges upon the flange of the sampling
disk. Whenever the sample spout comes in line with the ore stream, the ore
passes through the plate and into the sample; at all other times the ore
is deflected from the plate and drops into the reject. Generally, the
sampler makes from 10 to 30 rpm, and removes about 1/5 of the ore stream.
Newton, 1; Newton, 2
a. A phase of a heating operation during which metal is maintained at the
requisite temperature until the temperature is uniform throughout the
mass. CTD
b. Prolonged holding at a selected temperature. ASM, 1
See:steatite
See:soapstone
a. Massive talc. Syn:steatite; soaprock.
b. A metamorphic rock of massive, schistose, or interlaced fibrous or
flaky texture and soft, unctuous (greasy) feel; composed essentially of
talc with variable amounts of mica, chlorite, amphibole, and pyroxene;
alteration product of ultramafic rock; may be carved into art objects or
sawn into dimension stone for use where chemical resistance or high heat
capacity is needed.
c. A miners' and drillers' term for any soft, unctuous rock.
Syn:agalmatolite; Manchurian jade; talcum.
d. See:saponite; talc.
Unctuous; said of talc and other magnesium minerals. Nelson
Eng. In stones, joints filled with saponaceous or talclike mineral.
An aluminum-rich variety of saponite(?).
a. A device fastened to the end of a rope by means of which the rope may
be attached to its load; the socket may be opened or closed. Zern
b. In blasting, the hole left after firing. Pryor, 3
c. A hollow tool for grasping and lifting tools that have been dropped
into a well boring. Standard, 2
d. The point in a borehole, usually in bedrock, at which the bottom end of
a string of casing or drivepipe is set. Long
e. To lower casing or drivepipe into, and seat it in, a borehole.
Long
f. An overshot. Long
g. A fishing tool designed to encircle and grasp a cylindrical object.
Long
h. To spring a borehole. See also:camouflet
i. See:bootleg
a. The normal carbonate of sodium, Na2 CO3 , soda ash; the
latter being the common name of the commercial product used in chemical
industries.
b. Sodium carbonate, Na2 CO3 ; esp. the decahydrate, Na (sub
2) CO3 .10H2 O. Loosely used for sodium oxide, sodium
hydroxide, sodium bicarbonate, and even for sodium in informal expressions
such as soda spar. A prefix added to the names of igneous rocks to
indicate that they contain soda pyroxenes and/or soda amphiboles; e.g.,
soda rhyolite, soda trachyte, soda granite, etc. AGI
c. A former name for natron.
a. An alum of aluminum and sodium. Occurs in nature as the mineral
mendozite. See also:mendozite
b. See:sodium alum
A laborer who sifts soda ash for use in refining copper. DOT