A graphic method of coal-seam correlation, involving the mapping and
drawing of both vertical and horizontal sections. AGI
A lightweight inner container for explosive materials, usually encased in
a substantial shipping container called a case. Atlas
a. An individual closed shell, bag, or tube of circular cross section
containing explosive material. Atlas
b. A cylindrical, waterproof, paper shell, filled with high explosive and
closed at both ends, that is used in blasting.
c. A cylindrical, waterproof, paper shell filled with cement or other
material used in plugging or sealing cavities or cavey ground encountered
in drilling a borehole. See also:plug
d. Cylinder--about 4 in (10 cm) long and 2-1/2 in (6.4 cm) in diameter--of
highly compressed caustic lime made with a groove along the side, used in
breaking down coal.
e. A single pellet of explosive, which may be 4 oz or 8 oz (113.4 g or
226.8 g). Nelson
The number of cartridges in a standard case, which typically contains
about 50 lb (22.7 kg) of explosive material.
A fuse enclosed in an insulating tube in order to confine the arc when the
fuse blows. Crispin
A wooden, plastic, or non-sparking metallic device used to punch an
opening in an explosive cartridge to accept a detonator or a section of
detonating cord. Atlas
A rating that compares a given volume of explosive with an equivalent
volume of straight nitroglycerin dynamite, expressed as a percentage.
Syn:bulk strength
A series of cars attached to and propelled by an endless chain or other
linkage running on a horizontal or slight incline.
Casagrande liquid limit apparatus
An appliance to determine the liquid limit of a soil. It consists of a
brass dish, handle, and cam mounted on a hard rubber base. The dish falls
through a distance of 1 cm per rotation. A sample of soil 1 cm thick is
placed in the dish with a groove 11 mm wide at the top and 2 mm at the
bottom. The number of jars required to cause the 2-mm gap to close along
1/2 in (12.7 mm) is recorded. Nelson
A thermal process for drying fine coal. An example of this type is the
Conreur dryer. Coal entering the top of the drying tower is carried down
by a series of rollers, being permeated by an ascending stream of hot air.
Fixed baffles direct the air to facilitate mingling. The very finest
particles may have to be recovered by dry filters or wet scrubbers. The
dryer treats coal with a top size ranging from 1/4 to 2 in (0.64 to 5.08
cm). See also:fluidized bed dryer; thermal drying. Nelson
Externally impressed signal series that connects several controllers or
resetting devices in series. Pryor, 3
Elementary type of flotation cell in which air is entrained by a plunging
cascade of pulp; mineralized bubbles are removed farther downstream.
Pryor, 3
See:countercurrent decantation
Movement of crop load in a ball mill rotating at such a speed that the
balls breaking free at the top of the rising load roll quietly down to the
toe of the charge. With increased peripheral speed, motion changes to
turbulent cataracting and, still faster, to avalanching when the upper
layer of crushing bodies breaks clear and falls freely to the top of the
crop load. Pryor, 3
A sodic minette containing biotite, olivine, and augite phenocrysts in a
groundmass composed almost entirely of alkali feldspar. Principally a dike
rock. AGI
a. A small fissure, admitting water into the mine workings.
b. One of the frames, of four pieces of plank each, placed side by side to
form a continuous lining in galleries run in loose earth.
Webster 2nd
c. To line a borehole with steel tubing, such as casing or pipe.
Syn:case in
d. In a ferrous alloy, the outer portion that has been made harder than
the inner portion, or core, by casehardening. ASM, 1
A borehole lined with some form of steel tubing, such as casing or pipe.
See also:case off
See:case off
a. The geological process by which the surface of a porous rock, esp. a
sandstone or a tuff, is coated by a cement or a desert varnish; formed by
the evaporation of a mineral-bearing solution. AGI
b. Hardening a ferrous alloy so that the outer portion, or case, is made
substantially harder than the inner portion, or core. Typical processes
used for casehardening are carburizing, cyaniding, carbonitriding,
nitriding, induction hardening, and flame hardening. ASM, 1
See:case