To form anew by running, as molten metal, into a mold; cast again; as, to
recast a cracked bell. Standard, 2
A hopper used to receive and direct material to a conveyor.
The later of the two geologic epochs comprised in the Quaternary period,
in the classification generally used; Holocene. Also, the deposits formed
during that epoch. Recent includes the geologic time and deposits from the
close of the Pleistocene (glacial) epoch until and including the present.
See:acceptor
Going back, as the gradual retreat of a waterfall or an erosional
escarpment, the melting back of a glacier, or the withdrawal of a body of
water so that the shoreline moves successively farther away from the
higher land. Stokes
a. The processes by which water is absorbed and added to the zone of
saturation, either directly into an aquifer or indirectly by way of
another formation; also, the quantity of water so added.
b. Putting water brought from elsewhere into a body of ground water to
augment ground-water supply. See also:intake area
An array of points, each point at a distance that is the reciprocal of the
d spacing between planes in the direction normal to each set of parallel
planes as measured from the origin. Each reciprocal-lattice point may be
associated with Bragg diffraction in a crystal. CF:crystal lattice;
direct lattice; X-ray diffraction.
In elastic theory, an ellipsoid of certain shape and orientation that
under homogeneous strain is transformed into a sphere.
CF:strain ellipsoid
Having a straight back-and-forth or up-and-down motion. Nichols, 1
A piston drill often referred to as a hammer drill. Hammond
Any steam or internal-combustion engine, which has a piston moving under
pressure within a cylinder. Hammond
a. A feeder in which the material is carried on a plate subjected to a
reciprocating motion and so constructed that when the plate moves in the
reverse direction the material remains stationary. The rate of feed is
normally varied by adjusting the stroke of the reciprocating plate.
See also:plate feeder
b. A device used to empty a bin or hopper from the bottom by horizontal
reciprocating action of its parts, usually after primary crushing.
ACSG, 2
A reciprocating beam or beams with hinged flights arranged to advance bulk
material along a conveyor trough. See also:grit collector
A pump consisting of a piston or plunger which lifts water to a higher
level by a series of to-and-fro movements. See also:pump
Nelson
Usually an inclined reciprocating screen on which the coal travels and
through which the hot gases pass. The screen may eliminate moisture in
coal up to 2-1/2 in (6.4 cm) in size. It may also serve as a fine coal
dryer to treat coals down to 1/8 in (0.32 cm). Nelson
Circulating water that has been in the circuit for more than one cycle,
often recovered from a collecting device such as a thickener from which
the clarified water is circulated back into the process stream.
The continuous circulation of all or some part of the same air in part of
a mine ventilation system. BS, 8
A term describing a condition in which the ventilating air current is
returned to the face repeatedly along a circuitous path. It may happen in
the case of auxiliary fans or booster fans. If the intake end of the air
pipes of a blowing fan is not placed well to the intake side of the main
air current, the foul air from the heading may be recirculated to the face
again and again. With an exhausting auxiliary fan, the end of the pipes is
kept well to the return side of the main air current.
See also:two-fan auxiliary ventilation
The water used in a condenser or in a washery or other wet process is
often repumped into the system by means of a circulating pump. The
practice is economical in water and in reagent consumption and also
reduces pollution of local streams. Water that is recirculated is
clarified to reasonable purity. See also:washery water
a. Digging from stockpiles. Nichols, 1
b. Reprocessing previously rejected material. Nichols, 1
a. Any of several types of conveyors used to reclaim bulk materials from
storage.
b. The conveyor which receives material from the reclaimer in a blending
system.