A laborer who removes studs from aluminum reduction pots by operating a
motor-driven hydraulic jack. DOT
a. A vanadium ore. Osborne
b. A mineral, Ca2 V2 O7 .9H2 O ; green; forms
water-soluble efflorescences; associated with uranium-vanadium deposits of
the Colorado Plateau.
A thread on the outside surface of a cylindrical or tubular member.
Syn:male thread
A roof support method following two basic principles: (1) that of drilling
holes vertically or at an angle into the roof and anchoring roof bolts
into a strong firm structure above the lower weak layers, thereby
suspending the weak roof on bolts from the strong roof above; and (2) the
binding of several layers of weak strata into a beam strong enough to
support its weight across the working place. The advantage of pin
timbering is that support can be provided at the face without posts being
in the way of equipment and more freedom is provided for shuttle cars and
other equipment in tramming. See also:timbering; roof bolting.
Kentucky
A vertical pin fastened at the bottom that serves as a center of rotation.
Nichols, 1
A towing device consisting of a fixed lower jaw, a hinged and lockable
upper jaw, and a socket between them to hold a tow ring.
Nichols, 1
The currently accepted term for a coupling, one end of which is threaded
on the outside (pin) and the opposite end threaded on the inside (box).
Formerly designated as a male-to-female coupling. Long
The currently accepted term for a coupling, both ends of which are
threaded on the outside. Formerly designated as a male-to-male coupling.
Long
Two or more endless chains to which crossbars are attached at spaced
intervals, each having affixed to it a series of pointed rods extending in
a vertical plane on which work is carried. Used principally in spraying or
washing operations where the least amount of area of the product is
contacted.
An elementary particle; the contraction of pi-meson. The mass of a charged
pion is about 273 times that of an electron. An electrically neutral pion
has a mass 264 times that of an electron. Lyman
The first bench in a quarry which is blasted out. It is usually at the top
of the rock to be quarried.
A primitive, temporary road built along the route of a job, to provide
means for moving equipment and workers. Nichols, 1
U.K. The advance vibration set up by a coal dust explosion.
See also:advance wave; shock wave. Nelson
See:saponite
a. A cylindrical, more or less vertical orebody. Syn:chimney; ore pipe;
shoot; stock. AGI
b. A vertical conduit through the Earth's crust; e.g., a kimberlite pipe
of South Africa, through which magmatic materials have passed. It is
usually filled with volcanic breccia and fragments of older rock. As a
zone of high permeability, it is commonly mineralized. AGI
c. A tubular cavity from several centimeters to a few meters in depth,
formed esp. in calcareous rocks, and often filled with sand and gravel;
e.g., a vertical joint or sinkhole in chalk, enlarged by solution of the
carbonate material and filled with clastic material. See also:piping
AGI
d. The name given to the fossil trunks of trees found in coalbeds.
Fay
A bit designed for attachment to standard coupled pipe for use in securing
the pipe in bedrock. Can be set with diamonds or other abrasive materials.
Long
a. A device similar to a casing clamp, used in the same manner on pipe as
a casing clamp is used on casing. See also:casing clamp
b. A pipe wrench constructed like a parmalee wrench. Long
a. Originally a clay suitable for making tobacco pipes, but the term is
now used to include any white-burning plastic clay. Nelson
b. A mass of fine clay, generally of lenticular form, found embedded in or
below a placer gravel bank.
A device which measures only the density of the magnetic components of a
slurry. This electromagnetic sensing unit is mounted on a section of
rubber or stainless-steel pipe which is installed as a section of the
slurry-carrying pipeline. All components are exterior to the pipe, and
there is no obstruction to flow. The pipe coil is used widely in magnetic
taconite and heavy-media plants. By combining this device with other
instruments, it is possible to continuously measure the ore-to-media
ratio. Nelson
An internally threaded, short, sleevelike member of ordinary steel used to
join lengths of pipe. Sometimes incorrectly called pipe collar; pipe
sleeve. Long
A tool for cutting wrought iron or steel pipes. The curved end which
partly encircles the pipe carries one or more cutting disks.
Crispin