A discredited term equal to walpurgite. Am. Mineral., 1
An emerald glass or beryloscope mounted to resemble a hand loupe. Observed
through it the filament of an incandescent lamp appears reddish yellow,
and this color is not changed when also passing through most genuine
emeralds; but a Brazilian emerald from Minas Geraes appears green, an
epidote red, and a dioptase green. Syn:emerald loupe
See also:emerald glass
a. An unintentional change in the course of a borehole. CF:deviate;
walk; warp. Long
b. See:band wander
A defect in a timber or plank. Crispin
A zone in which the coal of a coal seam is missing, owing to a low-angle
normal fault or a washout, squeeze, or roll. CF:nip; pinch.
Syn:cutout
A hand drill that can be used in a river on a barge or on a platform built
on two large canoes. Basically, it consists of four straight poles, 5 to 7
in (12.7 to 17.8 cm) in diameter at the large end, which are set into
notches in planks to prevent their sinking into the ground. The poles are
joined at the top by a shaft that holds the pulley for the drill wire or
rope. The walking beam is activated by 8 to 10 persons lining up on the
crossarm. They pull down to raise the tools and vary their manner of
movement, depending on whether they are driving casing, drilling, or
pulling casing. The Ward drill is most efficient in shallow ground, but
can be used in depths up to 90 ft (27.4 m). Mining
a. A term used in south Wales for a strong massive sandstone associated
with coal. AGI
b. In Australia an officer under the Mining Act with magisterial and
executive authority over a goldfield.
A tetragonal mineral, NaAl3 (PO4 )2 (OH)4 .2H
2 O ; bluish-green; forms oolitic or crystalline encrusting layers;
in Cedar Valley and near Fairfield, UT.
a. A method of controlling the speed of electric winding or other large
direct-current motors, employing a variable voltage generator to supply
the motor armature, and driven by a shunt motor.
See also:automatic cyclic winding; Ilgner system. Nelson
b. In a modification, the Ward-Leonard-Ilgner system incorporates a heavy
flywheel on the shaft of the generator, which smooths out surges in the
system. Pryor, 3
A hydrated sulfate of copper that shows an emerald green color.
Syn:brochantite
Eng. Black slaty stone overlying coal seams, Somerset Coalfields. Also
spelled werk.
The lines drawn on working plans to indicate the limit beyond which
workings should not extend; e.g., because of the proximity of disused or
abandoned workings. BS, 7
a. The amount a borehole has wandered off course. CF:wander
Long
b. A general term for a bed or layer of sediment deposited by water; e.g.,
an estuarine clay, or the alluvium laid down by a tidal river.
See also:warping
A fault, usually a thrust fault, that has been slightly folded.
AGI
The slight flexing or bending of the Earth's crust on a broad or regional
scale, either upward (upwarping) or downward (downwarping); the formation
of a warp. AGI
a. A general term for the clay floors of coal seams, particularly when
hard and tough. See also:underclay
b. The document of title to metal stored in an LME registered warehouse.
The warrant is a bearer instrument and states the brand of metal, its
weight, the number of pieces, and the rent payable. Wolff
See:underclay
See:fireclay
A triangulated truss made up only of sloping members between the
horizontal top and bottom members with no verticals. See also:N-truss
Hammond
a. A general term for gaseous and liquid bitumens consisting mainly of a
mixture of paraffins and isoparaffins: a variety of petroleum rich in
paraffins.
b. A pink cobaltoan variety of smithsonite.
c. A discredited name for owyheeite or jamesonite.
Strand construction in which one layer of wires is composed of pairs of
large and small wires, thus 6 x 19 (6 and 6/6/1) equal laid.
See also:equal lay