Visual-type portable photometer operated by visual comparison of
brightness. So named because it can be calibrated to indicate the
photometric brightness of the object viewed in the sighting telescope.
Roberts, 2
a. Coal that reflects a large part of incident light, either in a definite
beam or by scattering. Two kinds of bright coal are distinguished:
vitrain, which reflects an incident beam in a definite direction and
consequently appears light or dark according to whether the beam is or is
not reflected into the eye; and clarain, which scatters the light and
shows a silky luster at whatever angle it is viewed. Tomkeieff
b. A commercial term for the larger sizes of bright coal. BS, 4
Crude sulfur free of discoloring impurities and bright yellow in color.
USBM, 7
A common name for sulfur. Syn:brenston
a. Water saturated or strongly impregnated with common salt.
b. Sea water containing a higher concentration of dissolved salt than that
of the ordinary ocean. CF:artificial brine
A section of land under which quantities of rock salt or natural brine of
usable strength have been discovered and a well, or any number of wells,
has been bored for raising the brine. Kaufmann
A test for determining the hardness of a material by forcing a hard steel
or carbide ball of specified diameter into it under a specified load. The
result is expressed as the Brinell hardness number, which is the value
obtained by dividing the applied load in kilograms by the surface area of
the resulting impression in square millimeters.
CF:Vickers hardness test
a. In heat treating, one who determines the hardness of pieces of metal by
the Brinell hardness test. Also called Brinell operator. DOT
b. The machine or instrument used to determine hardness.
A salt well, or an opening at the mouth of a salt spring, from which water
is taken to be evaporated for making salt. AGI
A cased drill hole penetrating a salt formation through which water is
introduced and brine pumped to the surface.
Can. Develop a mine from prospect stage. Hoffman
A block of compressed coal dust, used as fuel; also, a slab or block of
artificial stone. Syn:brick fuel; coalette; eggette. Also called
boulet; carbonet. Also spelled briquet. See also:solid smokeless fuel
Standard, 2
A process by which coke breeze, coal dust, iron ore, or any other
pulverized mineral is bound together into briquettes, under pressure, with
or without a binding agent such as asphalt, and thus made conveniently
available for further processing or for commercial markets.
Y p ܟ gDICTIONARY TERMS:Briska detonator An aluminum tube containing a main
[\B]Briska detonator[\N]
In mineral processing, a pneumatic flotation cell 7 to 9 ft (2.1 to 2.7 m)
deep. See also:southwestern cell
Scot. See:breeching
British equivalent temperature
Heat needed to raise 1 lb (0.45 kg) of water 1 degrees F (5/9 degrees C)
(equal to 252 cal or 1,054 J). Symbol, Btu. CF:heat unit
Pryor, 3
A nonductile material that fails catastrophically under dynamic loading
conditions. Ceramics are an example of a class of brittle materials.
Hunt
Group of micas having brittle laminae. Chief member is chloritoid, a basic
silicate of aluminum, iron, and magnesium, Fe2+ ,Mg,Mn)2
Al4 Si2 O10 (OH)4 . See also:mica;
margarite. Pryor, 3
a. Of minerals, proneness to fracture under low stress. A quality
affecting behavior during comminution of ore, whereby one species
fractures more readily than others in the material being crushed.
See also:toughness
b. The quality of a material that leads to crack propagation without
appreciable plastic deformation. ASM, 1
See:stephanite