A method of treating mine timber in which the timber is painted with a
preservative or is merely dipped into a tank of preservative.
Preservatives used are creosote, zinc chloride, sodium fluoride, and other
chemicals. See also:timber preservation
Mid. Lump of coal weighing about 1 lb.
See:broil
A device that marks the paths of charged particles by photographing the
train of bubbles they produce as they move through certain superheated
liquids. See also:cloud chamber; spark chamber. Lyman
Method of testing small grains of minerals to ascertain their response to
flotation collector agents. A bubble of air is pressed down on particles
under water, and then raised and examined to find whether it has lifted
any grains. This is often done by using a single bubble device for
determining fundamental aspects of the mineral-bubble interaction.
Tube inserted in pulp at regulated depth, through which compressed air is
gently bubbled. The air pressure indicates the pulp density and provides a
means of control. Pryor, 4
A pulsation attributable to the bubble produced by a seismic charge fired
in deep water. The bubble pulsates several times with a period
proportional to the cube root of the charge, each oscillation producing an
identical unwanted seismic effect. AGI
Air introduced near the bottom of a flotation cell containing pulped ore
forms coursing bubbles, which rise through the liquid and emerge as
mineralized bubbles forming a semistable froth column. This depends for
its continuity partly on the surface-active reagents borne by the mineral
in the air-water interphase of each bubble and partly on the aid of
frothing reagents. Pryor, 1
A resin resembling amber but insoluble in alcohol and yielding no succinic
acid. Fay
A porcelain filter shaped to support filter paper on a flat perforated
disk. Pryor, 3
a. A large quartz reef in which there is little or no gold.
See also:bull quartz
b. To push coal down a chute toward a mine car. Zern
c. To break up or pulverize, as to buck ore samples. Webster 3rd
d. To bring or carry, as to buck water. Webster 3rd
One who breaks ore.
a. See:bailer; calyx.
b. Tubular container equipped with auger or other-type cutting edges used
to make borings in earthy or soft formation by rotary methods.
Long
c. An open-top can, equipped with a bail, used to hoist broken rock or
water and to lower supplies and equipment to workers in a mine shaft or
other underground opening. Long
d. One of the conveying units on a bucket conveyor that lifts the material
from a boot or bin when passing over the lower sprocket and is dumped on
passing over the upper sprocket. The bucket is often made of perforated
metal so that water entrapped will pass through the perforations and back
to the boot. Zern
e. A part of an excavator that digs, lifts, and carries dirt.
Nichols, 1
f. The dipper or scoop at the end of the arm of a bucket dredge.
Webster 3rd
A short helical auger incorporating a steel tube to help hold the cuttings
on the auger during withdrawal from the drill hole. See also:auger
Long
A conveyor consisting of a continuous line of buckets attached by pivots
to two endless roller chains running on tracks and driven by sprockets.
The buckets are so pivoted that they remain in an upright position at all
times except when tilted into a dumping position by a cam or other device
placed at any required position on the track. See also:bucket elevator;
gravity-discharge conveyor elevator; pivoted-bucket conveyor.
BS, 5
A dredge having two pontoons, between which passes a chain of digging
buckets. These buckets excavate material at the bottom of the pond
(paddock) in which the dredge floats, and deposit it in concentrating
devices on the decks. Pryor, 3
Originally developed as an aid in making excavations for cesspools and
septic tanks; now used mostly in drilling holes for concrete piers on
construction jobs. Also called bucket drilling.
a. An appliance for elevating material, consisting of steel buckets
fastened to an endless belt or chain. It is usually set at steep angles,
around 70 degrees . The load is picked up by discharge from a chute or by
a dredging action in a boot. Its best application is in a plant where
space is restricted and the size of the material is less than 2 in (5.1
cm). Syn:chain elevator
b. See also:centrifugal discharge bucket elevator;
continuous-bucket elevator; double-leg bucket elevator; elevator;
gravity-discharge conveyor elevator; internal-discharge bucket elevator;
positive-discharge bucket elevator; pivoted-bucket conveyor;
grit collector.
A belt fabricated for bucket elevator use, to which an elevator bucket is
attached.
See:fill factor
See:bin gate