Obsolete method of winning coal or bedded iron from shallow deposits, in
which mineral was extracted and dragged to a central shaft.
Pryor, 3
See:Bell's dephosphorizing process
An internally threaded bell-shaped iron bar for recovering broken or lost
rods in a deep borehole. Syn:box bell; screw bell; bell tap.
Fay
Bell's dephosphorizing process
The removal of phosphorus from molten pig iron in a puddling furnace lined
with iron oxide and fitted with a mechanical rabble to agitate the bath.
Red-hot iron ore is added. See also:Krupp washing process
Syn:Bell process
Aust. A sheave in the shape of a truncated cone used in connection with
the main-and-tail system of rope haulage at curves, so as to keep the rope
close to the ground. Fay
See:bell tap; screw bell.
A cylindrical fishing tool having an upward-tapered inside surface
provided with hardened threads. When slipped over the upper end of lost,
cylindrical, downhole drilling equipment and turned, the threaded inside
surface of the bell tap cuts into and grips the outside surface of the
lost equipment. Also called bell; box bill; die; die collar; die nipple.
See also:bell screw; screw bell; die. Syn:bell socket; outside tap.
Long
Term used to describe a good roof that has a clear ringing sound.
Kentucky
See:bellan
a. Derb. A system of working an ironstone measure by upward underground
excavations around the shafts (raises) in the form of a bell or cone.
Fay
b. A method used in working salt deposits. Standard, 2
a. See:pocket
b. A bulge, or mass of ore in a lode. Fay
c. Widened places in a borehole caused by sloughing of loose material from
the borehole sidewalls. See also:bellies
A flaring-mouthed blast pipe in an iron furnace. Standard, 2
Trade name for moonstone from the White Sea. Spencer, 3
A white, transparent magnesium molybdate, MgMoO4 , crystallizing in
the tetragonal system. Fay
An elongated or acicular crystallite having rounded or pointed ends.
AGI
A hexagonal mineral, (Sr,Ce,Na,Ca)5 (PO4 )3 (OH) ;
apatite group; occurs in pegmatites.
a. See:link-plate belt
b. Can. Regional surface zone along which mines and prospects occur.
Hoffman
c. A continuous strap or band for transmitting power from one wheel to
another, or (rarely) to a shaft, by friction.
See also:stitched canvas conveyor belt
d. A zone or band of a particular kind of rock strata exposed on the
surface. CF:zone
e. An elongated area of mineralization. AGI
The load that a belt conveyor is able to carry, depending upon the area of
cross section of load on belt and the speed of the belt. Nelson
A device attached to a belt conveyor to clean or remove dirt or coal dust
from the belt surface. Rotary bristle brushes are sometimes used, driven
either by gearing from the conveyor or by an independent high-speed motor.
Another device consists of a short scraper conveyor with rubber-faced
scrapers attached at intervals. The scraper belt is driven via a chain
drive from the main conveyor drum. Nelson
a. A moving endless belt that rides on rollers and on which materials can
be carried. The principal parts of a belt conveyor are (1) a belt to carry
the load and transmit the pull, (2) a driving unit, (3) a supporting
structure and idler rollers between the terminal drums, and (4)
accessories, which include devices for maintaining belt tension and
loading and unloading the belt, and equipment for cleaning and protecting
the belt. See also:hatch conveyor; underground mine conveyor.
Kentucky; Nelson
b. See:troughed belt conveyor
The framework for supporting the bottom strand of a belt conveyor.
Nelson