A type of counterpoised beam balance. CF:Westphal balance
See:fuller's earth
a. The movement forward or backward of a dredge by first winding up on one
side and then the other, swinging the boat from side to side and thereby
advancing with a slight offsetting to the side. Fay
b. See:walk
A trunnion or walking beam. Nichols, 1
a. The beam used to impart a reciprocating movement to the drilling column
in percussive drilling. Syn:oscillating beam; rocking beam.
BS, 9
b. On cable tool and churn drill rigs, the beam that carries the string of
drilling tools at one end and is connected to a cranked drive wheel at the
other. The rotation of the wheel causes the tool string to lift and drop;
thus the hole is drilled by concussion. Long
A light crane traveling on an overhead channel iron and a single rail
vertically beneath this in the floor. Webster 3rd
a. A dragline that is equipped with apparatus that permits it to "walk" by
the alternate power movement of vertical booms fastened to large outrigger
platforms so arranged as to push the equipment forward as work progresses.
BCI
b. An excavator of very large capacity, equipped with walking beams
operated by eccentrics in place of crawler tracks. Such machines can
excavate 1,650 st/h (1,500 t/h) of overburden to a depth of 100 ft (30 m).
Hammond
See:joy walking miner.
Act of walking out or leaving; specif., a labor strike.
Webster 2nd
a. The side of a level or drift. Fay
b. The country rock bounding a vein laterally. The side of a lode; the
overhanging side is known as the hanging wall and the lower lying side as
the footwall. See also:hanging wall; footwall. Syn:walls of a vein
Fay
c. The face of a longwall working or stall, commonly called a coal wall.
Fay
d. A rib of solid coal between two rooms; also, the sides of an entry.
BCI
Material adhering to the inner walls of a blast furnace between the water
jackets and the feed door. Fay
Mixing device, driven by an impeller, used in pulp mixing and aeration in
cyanidation where strong agitation is needed. Pryor, 3
a. A person who supervises a crew of workers operating a face conveyor.
Hess
b. See:room boss
See:cake
The development of enlarged sections in a borehole as the result of
caving, erosive action of the circulated liquid, or erosion caused by
drill rods rubbing against the borehole walls. Long
The distance between the wall of the borehole and the outside of a piece
of drill-string equipment when the string is centered in the borehole.
Long
See:closure
Ore shoots that occur adjacent to certain favorable wall rocks that
presumably influenced deposition from the mineralizing fluids.
Stokes
The amount of friction resulting from the drill rods rubbing against the
walls of a borehole or the inside surface of the casing lining a borehole.
Long