A scoop-shaped bamboo basket used in Japan for carrying auriferous gravel.
A trigonal mineral, Bi4 TeS2 ; sp gr, 7.9; at San
Jose, Minas Gerais, Brazil. A related mineral, jose#1.ite-B, contains more
tellurium and less sulfur.
See:hartite
A gray, nickeliferous iron, Fe2 Ni5 or FeNi3 .
Massive, granular, and forms the metallic portion of rolled pebbles. From
Josephine County, OR. Syn:native nickel-iron
a. The absolute meter-kilogram-second (mks) unit of work or energy that
equals 107 erg or approx. 0.7377 ft.lb or 0.2390 g (caloric); the
standard in the United States. Webster 3rd
b. The gram-degree centigrade thermal unit; the small calorie.
Standard, 2
The rate at which heat is produced by a steady current in any part of an
electric circuit is jointly proportional to the resistance and to the
square of the current. Webster 3rd
Derb. Hollows in a vein.
A colorless synthetic spinel used as a simulated diamond.
That part of a rotating shaft resting in a bearing. Long
a. Welsh term for train of mine cars moved mechanically. Also called gang;
set; rake. Pryor, 3
b. A cycle of work done in glass manufacturing in converting a quantity of
material into glass or glass products. Webster 3rd
A cutter loader for continuous mining on a longwall face. It consists of
two cutting heads fixed at each end of a continuous-track-mounted chassis.
The heads are pivoted and controlled hydraulically for vertical movement.
Each head comprises two bores and a frame or loop cutter that trims the
bottom, face, and top. A cross conveyor delivers the coal to the adjacent
face conveyor. The machine cuts a web of 5 ft (1.5 m) in seams from 37-1/2
in (95 cm) to 5 ft high. With an overall length of 18 ft (5.5 m), it
weighs 15 st (13.6 t). Nelson
A belt conveyor to serve between a loader or continuous miner and the main
transport. It consists of two main units, a head and a tail section, each
mounted on crawler tracks and independently driven. In operation, the tail
unit (i.e., the receiving end) moves forward with the loading machine, and
belting is automatically released from a loop takeup. Fifty feet (15 m) of
advance is possible before additional belting has to be inserted into the
conveyor run. Capacity equals 280 st/h (254 t/h) with a 30-in (76-cm)
belt. Nelson
An arrangement to provide a link between a continuous miner and the main
transport. The equipment is hydraulically driven, and the steel band is
coiled on the drivehead. Nelson
Loading machine for coal or ore that uses mechanical arms to gather
mineral onto an apron pressed into the severed material. A built-in
conveyor then lifts it into tubs or onto a conveyor. Pryor, 3
A wet-type dust collector for use at the return end of tunnels or hard
headings. It may be either 6,000 ft3 /min or 12,000 ft3
/min (2.8 m3 /s or 5.7 m3 /s) in capacity. It wets and
traps dust as it passes through the appliance, and releases it in the form
of a slurry, which is removed by a pump. The microdyne is bolted to the
outby end of the exhaust pipe, and the auxiliary fan is bolted to the
outby end of the dust collector. Nelson
A rubber-tired, self-propelled loading, transporting, and dumping machine.
A continuous miner with a walking mechanism instead of crawler tracks. The
walking mechanism was adopted to make the machine suitable for thin seams.
The lowest crawler-track-mounted machine can operate in a minimum seam
height of 4 ft (1.2 m), whereas the walking type can work in a 2.5-ft
(0.76-m) seam. Syn:walking miner
A small wagon, running on rails, which tips sideways. Hammond
Eng. Top jubs and bottom jubs, soft marly limestone, coarsely oolitic in
places, in the Great Oolite at Kingsthorpe, Northamptonshire; also in the
same formation at Bedford. Arkell
a. N. of Eng. A block of coal about 4 yd (3.7 m) square, holed and cut
ready for breaking down. Fay
b. In whole working, a portion of the coal laid out and ready for
extraction; in pillar working (i.e., the drawing or extraction of
pillars), the yet unremoved portion of a pillar. Fay
c. Applied to a working place, usually 6 to 8 yd (5.5 to 7.3 m) wide,
driven in a pillar of coal. When a jud has been driven the distance
required, the timber and rails are removed, and this is termed "drawing a
jud." Zern
d. Som. See:jad; lift.
a. Derb.; Newc. A measuring stick to measure coal work underground.
See also:judge rapper
b. Eng. Formerly a youth who proved the holing. Fay