Dev. A small vein.
A whetstone suitable for sharpening scythes.
a. An ocean, or alternatively a large body of (usually) salt water less
than an ocean. AGI
b. Waves caused by wind at the place and time of observation. AGI
c. State of the ocean or lake surface in regard to waves. AGI
Alaska. Placers adjacent to the seashore to which the waves have access.
See:plankton bloom
a. Old name for bituminous coal; so named either because it was exported
by sea from collieries in coastal districts, or because it was at first
applied to coal washed ashore from deposits below sea level.
Arkell
b. Coal dug from the earth; so called formerly to distinguish it from
charcoal, because it was brought to London by sea. Known formerly as pit
coal or earth coal. Standard, 2
c. U.S. Rare. Soft coal as distinguished from anthracite.
Standard, 2
d. Archaic. Mineral coal. Webster 3rd
e. Pulverized bituminous coal used as a foundry facing.
Webster 3rd
The currents that constitute part of the general oceanic circulation. Syn.
for ocean current. Schieferdecker
See:trench
a. An early syn. for meerschaum.
b. See:sepiolite
a. To secure a borehole or excavation against cave-ins and flowing or
escaping gas or liquids by the use of cement or other sealants.
Long
b. To secure a mine opening against flowing or escaping gas, air, or
liquids by injecting grout, by coating rock surfaces with gunite, or by
erecting rock, concrete, wood, or cloth barriers. Long
c. A short length of roadway that has been tightly filled with concrete,
brickwork, sand, or other material to close off an area against fire, gas,
or water. In the case of a fire, the seal cuts off the air supply and also
prevents noxious fumes given off from reaching other parts of a mine. Also
called stopping. See also:firedamp
See:painting
Wire strand construction having one size of wires for the outer layer with
the same number of smaller wires in the underlayer. Both layers have the
same length and direction of lay. Hammond
In mining, portion of underground workings sealed off, usually because of
fire (in which case no air is allowed to enter) or because no mineable
coal remains in the area. See also:unsealing
A part of a mine that has been sealed off from the rest of the mine. The
object of sealing off a fire area is to: (1) contain the trouble, and to
prevent an explosion that may occur inby from extending to other parts of
the mine; (2) build up an extinctive atmosphere inside the sealed-off
area; and (3) prevent the access of air to the inby side of the seal.
Nelson
A wire rope that has six or eight strands each, having a large center wire
covered by nine small wires that are covered in turn by nine large wires.
Lewis
A wire rope with the inner and outer layers consisting of the same number
of wires, the outer being larger and lying in the grooves or valleys
between the inner wires. Both layers are stranded or laid in one
operation. Extra support is given to the outer wires by this method and
the wires are in line contact throughout and there is no internal
crosscutting of wires. Sinclair, 5
The deduction made from a measured length of a base line to establish its
true length at sea level. See also:tape corrections
a. Shutting off all air from a mine or portion of a mine, a practice used
in an emergency to check fire by eliminating oxygen. Also, as a routine
shutting-off method for worked-out areas in some mines. BCI
b. Sealing is used to overcome mine fires when other methods have failed.
It involves the erection of temporary or permanent seals for the purpose
of cutting off the oxygen supply to the area on fire. Sealing causes the
fire to extinguish itself by consuming the oxygen in the sealed off area.
Kentucky
c. Cutting off the air supply to effect extinction of underground fires by
erecting sandbag stoppings at convenient places. The combustion process
uses up the available oxygen within the sealed area, the process is
arrested and the hot ground cools down gradually as the heat is conducted
away by the surrounding cooler strata. See also:fire seal
Mason
d. Closing pores in anodic coatings to render them less absorbent.
ASM, 1
e. Plugging leaks in a casting by introducing thermosetting plastics into
porous areas and subsequently setting the plastice with heat.
ASM, 1
Pieces of wood full of resin found in brown coal. When ignited they burn,
melting and giving off soot and an aromatic odor like sealing wax.
AGI
The use of a cement or other sealant in a borehole. Seal off is not
synonymous with blankoff and case off, where securing the walls of a
borehole is accomplished by setting pipe or casing. CF:blankoff; seal.
Long
a. A stratum or bed of coal or other mineral; generally applied to large
deposits of coal. Fay; BCI
b. A particular bed or vein in a series of beds; it is usually said of
coal but may also pertain to ore minerals. AGI
c. A thin layer or stratum of rock separating two distinctive layers of
different composition or greater magnitude. AGI
d. A joint, cleft, or fissure. Syn:crevice
e. A plane in a coalbed at which the different layers of coal are easily
separated.
f. A very narrow vein.
g. See:joint line