A very fine-grained siliceous rock, containing up to 25% calcite, quarried
in central Turkey and used as a whetstone; novaculite.
Syn:Turkey slate
A turquoise. Standard, 2
Paper impregnated with an extract of turmeric. Used as a test for alkaline
substances, which turn it from yellow to reddish-brown, and for boric
acid, which turns it red-brown. Webster 3rd
a. A curve into a pillar. BCI
b. The time or period during which coal, etc., is raised from a mine. Also
called run; shift.
c. To open rooms, headings, or chutes off from an entry or gangway.
d. The number of cars allowed each miner. Good turn means many cars for
each miner. Fay
e. To draw or wind coal up a shaft or up an inclined plane to the surface.
Fay
f. Curved tramrails, often made of cast iron, laid round a corner or turn.
Fay
g. To set undried bricks on edge to facilitate drying. Standard, 2
To measure the angle between directions with a surveying instrument.
Nichols, 1
A wooden stick used in turning the tongs that hold a bloom under the
hammer. Fay
A bolt turned in a lathe to a close tolerance and used in steel-to-steel
connections. Hammond
A shaft sunk vertically in the hanging wall block until it intersects a
reef, after which it is sunk down at an angle in the footwall parallel to
the reef. This unusual practice is sometimes adopted on the Rand because
it enables the mine to become productive at an earlier stage.
See also:incline shaft
A yellowish-brown variety of monazite. Standard, 2
a. A point where workings turn from a crosscut to a level along the lode.
Gordon
b. The first cutting on a lode after it is cut in a crosscut.
Syn:house
See:moment of force
turning over and packing shift
On mechanized longwall faces, the shift during which face conveyors are
moved over, and the operations of ripping, packing, and drawing supports
from the wastes are performed. Mason
a. A surveying point on which a level rod is held, after a foresight has
been made on it, and before the differential-leveling instrument is moved
to another station so that a backsight may be made on it to determine the
height of instrument after the resetting; a point of intersection between
survey lines, such as the intervening point between two bench marks upon
which rod readings are taken. It is established for the purpose of
allowing the leveling instrument to be moved forward (alternately
leapfrogging with the rod) along the line of survey without a break in the
series of measured differences of elevation. Abbrev: TP. AGI
b. A physical object representing a turning point, such as a steel pin or
stake driven into the ground. AGI
Curved strips placed in a sharp bend or elbow in rectangular duct to
direct the air around the bend in a streamlined flow. Strock, 2
See:motor boss
a. The branching off of one rail track from another. Nelson
b. A contrivance for passing from one track to another. Zern
c. A siding or bypass in an underground haulageway.
d. A switch on a mine railroad. Korson
a. The distance the conveyor is advanced during each cycle of operations;
i.e., approx. the depth of machine cut.
See also:conventional machine mining
b. A device used to rotate an object through approx. 180 degrees so that
its carrying surface is changed to the opposite side.
c. See:move-up
A sheave fixed at the inside end of an endless or tail-rope hauling plane,
around which the rope returns. See also:tail sheave
A term used with any device used to change the direction of a shaker
conveyor trough line; e.g., curved trough turn, adjustable angle turn,
right angle turn, etc. The angle turn corresponds to the bell crank drive
in principle of operation. Jones, 1
See:flat sheet
a. A triclinic mineral, 1[CuAl6 (OH)8 (PO4 )4
.4H2 O] with Fe replacing Al toward chalcosiderite; forms waxy
blue-green reniform masses having a botryoidal surface, rarely with minute
crystals; occurs in arid regions where surface water acted on aluminous
rock; may be a gemstone. Also spelled turquois. Syn:Turkey stone;
calaite.
b. The mineral group aheylite, chalcosiderite, coeruleolactite, faustite,
planerite, and turquoise.