Traditionally, a forked wooden stick, cut from a willow or other
water-loving plant, used in dowsing. It supposedly dips downward sharply
when held over a body of ground water or a mineral deposit, thus revealing
the presence of these substances. Syn:witching stick; wiggle stick;
dowsing rod; twig. CF:water witch; waterfinder. AGI
A general term that includes joints, cleavage, faults, bedding planes, and
other surfaces of separation. AGI
One of three recognized methods for determining the average velocity of
airflow in a mine roadway by anemometer. This is the precise method of
determining the mean velocity of the air current. CF:single-spot method;
traversing method.
A breakdown product of xanthate collectors (flotation agents) with some
residual value for that purpose. Pryor, 3
A trigonal mineral, CuMn14 Fe(AsO3 )5 (SiO4 )
2 (AsO4 )(OH)6 ; forms nearly black aggregates of thin
folia; at Laangban, Sweden.
A former name for uranmicrolite. See also:microlite
A monoclinic mineral, Cu31 S16 ; X-ray pattern is similar
to, but distinct from, chalcocite.
Condensation products of ethanolamine and higher fatty acids, used as
flotation agents (collectors). Pryor, 3
See:wood tin
See:blaster
A hydraulic prop that is basically a self-contained hydraulic jack with an
integral pump unit built into the prop. It is designed to yield at 25 st
(22.7 t) and has a setting load of 6 st (5.4 t). Nelson
A self-advancing support for use on long-wall faces. One unit embodies
three props. The front prop, which is attached to the face conveyor,
carries two roof bars side by side that give cantilever support over the
conveyor track. The two rear props are mounted on a common floor bar and
carry a single roof bar that passes between the two front bars. The front
prop is attached to the rear structure only by the advancing ram within
the box structure of the floor bar. Nelson
A pay ticket containing particulars of shifts worked, coal filled, yardage
driven, and other work done, including the total wages less deductions.
Nelson
a. To treat a poor-quality carbon with substances such as oil, wax,
gutta-percha, solder, gum, or resin, to camouflage its defects, hence
changing its appearance to make it look like a better grade stone. Also
called dope. Long
b. A makeshift, temporary repair. Long
c. As used in the mining industry, to salt. Long
A round table resembling in operation a Wilfley table, and also like the
Pinder concentrator except that it is convex instead of concave. The table
does not revolve but has a peripheral jerking motion imparted to it
circumferentially by means of a toggle movement. Liddell
In isometric minerals, a cleavage parallel to the faces of a rhombic
dodecahedron 110 , e.g., sphalerite.
a. An isometric form composed of 12 equal rhombic faces, each parallel to
1 axis and intersecting the other 2 axes at equal distances, specif. named
the rhombic dodecahedron. See also:pyritohedron
b. Any solid with 12 symmetrically equivalent faces, e.g. deltoid;
pyritohedron.
c. The isometric form 110 , the rhombic dodecahedron.
d. Brazilian diamonds with the dodecahedral form, also called Brazilian
stone.
Each 12th of crystal space defined by a trigonal or hexagonal c axis and
its orthogonal three coplanar a axes. CF:octant
Similar to the Blake crusher, except the movable jaw is hinged at the
bottom. Therefore the discharge opening is fixed, giving a more uniform
product than the Blake with its discharge opening varying every stroke.
This type of jaw crusher gives the greatest movement on the largest lump.
Liddell
A hexagonal barrel revolving on a horizontal axis, containing perforated
die plates and screens. Pulverizing is done by steel balls inside the
barrel. Liddell
a. An iron bar, spiked at the ends, with which timbers are held together
and steadied.
b. A short, heavy iron bar, used as a drag behind a car or trip of cars
when ascending a slope to prevent them running back down the slope in case
of an accident; a drag.
c. See:casing dog
d. A trigger that limits the advance of a traversing table.
ACSG, 2
e. Any of various devices for holding, gripping, or fastening something.
See also:chair; dog; catch; wing. Webster 3rd
f. A drag for the wheel of a vehicle. Webster 3rd
g. A device attached to the workpiece by means of which the work is
revolved. ACSG, 2