For measuring entire internal capacity of a vessel: One register ton
equals 100 ft3 (1.8 m3 ); for measuring cargo; one U.S.
shipping ton equals 40 ft3 (1.1 m3 ) or 32.143 U.S.
bushels. Crispin
a. Any ore of greater value when broken than the cost of freight and
treatment.
b. See:first-class ore
The inner lining of a blast furnace. Standard, 2
An old English term for soft and crumbly shale, or slate clay approaching
shale. Also spelled chiver. Etymol: Middle English scifre. Adj: shivery.
AGI
A variety of calcite with slaty structure; specif. argentine.
Syn:slate spar
Eng. See:scamy
a. Waterworn fragments of vein minerals found on the surface, such as beds
of streams, away from the outcrop. Arkell
b. Float ore, which has broken from outcrop and gravitated to a distance.
Pryor, 3
c. To shoad, to trace a lode by following up shoad. Pryor, 3
d. Corn. Stream tin, or any surface rubble or talus containing fragments
of tin, copper, or lead ore, and signifying proximity of a lode.
Arkell
e. See:shode
Alteration of a wave proceeding from deep water into shallow water. The
wavelength decreases and the wave height increases. Hy
a. A rock bump caused by the sudden collapse of a thick sandstone or other
strong deposit. See also:rock burst; pressure bump. Nelson
b. A thump experienced in a mine when the breakage of overlying rocks
produces the effect of a hammer blow. Hammond
c. See:bumps
In winding, shock loads produced by picking up a cage from the pit bottom
with slack chains or by lifting heavy pithead gates or covers. This often
causes dry fatigue in the winding ropes. Sinclair, 5
Head losses resulting from changes in direction of flow or area of duct.
They also occur at the inlet or discharge of a system, at splits or
junctions of two or more currents of air, and at obstructions in airways.
Hartman, 2
There is a constant ratio between shock pressure loss and the velocity
pressure corresponding to the mean velocity of flow. Shock pressure losses
can be calculated from the following formula: Ps =XPv ,
where Ps equals the total shock pressure loss in inches of water, P v equals the velocity pressure, in inches of water corresponding to
the mean velocity of flow (equals approx. [V/4,000]2 at standard
air density of 0.075 lb/ft3 or 1.2 kg/m3 ), and X equals
an empirical factor or shock factor found by experiment. Ps and P
v are expressed in the same units and are equally affected by
density. X is therefore independent of both the density and the units used
and is the number of velocity pressures equivalent to the shock pressure
loss. Roberts, 1
As applied to the current-carrying parts of an electric system, excepting
trolley wires, is taken to mean that contact with such parts is prevented
by the use of grounded metallic coverings or sheaths.
A system for initiating blasting caps in which the energy is transmitted
to the cap by means of a shock wave inside a hollow plastic tube.
See also:gas detonation system; nonelectric blasting. Dick, 2
a. The wave of air and dust that, in some cases, travels ahead of the
flame of a coal dust explosion. It may occur when an ignition takes place
near the closed end of a mine roadway, and the reaction products behind
the flame cannot escape freely. Nelson
b. The wave sent out through the air by the discharge of the shot
initiating an explosion. The wave travels with the velocity of sound and
produces to the human ear a noise like the boom of a cannon.
Rice, 2
c. A compressional wave formed whenever the speed of a body relative to a
medium exceeds that at which the medium can transmit sound, having an
amplitude that exceeds the elastic limit of the medium in which it
travels, and characterized by a disturbed region of small but finite
thickness within which very abrupt changes occur in the pressure,
temperature, density, and velocity of the medium; e.g., the wave sent out
through the air by the discharge of the shot initiating an explosion. In
rock, it travels at supersonic velocities and is capable of vaporizing,
melting, mineralogically transforming, or strongly deforming rock
materials. AGI
Nonisentropic adiabatic compression in a wave traveling at greater than
local sound velocity. Van Dolah
a. Corn. A loose fragment of veinstone. Ore washed or detached from the
vein naturally. See also:float ore
b. Eng. To search for ore by tracing the shode. See also:shoad
a. A trough to convey ore to a crusher.
b. A metal block used in a variety of bending operations to form or
support the part being processed. ASM, 1
c. A coupling of rolled, cast, or forged steel to protect the lower end of
the casting or drivepipe in overburden, or the bottom end of a sampler
when pressed into a formation being sampled. Long
d. A wearing piece in various types of machines used to break rock, such
as a column of drill pipes; bottom of crushing stamp; muller of
amalgamating pan. Pryor, 3
e. The lower replaceable part of a gravity stamp which falls on the
mineral ore or rock. Nelson
See:paraschoepite
A mining claim in the form of a long narrow strip.
A location of a long and narrow strip of mineral land. Ricketts