See:random set
The setting of diamonds in a bit crown without regard to a geometric
pattern--without regular and even spacing. See also:random set
Long
a. A sample take without plan or pattern. Nelson
b. A subset of a statistical population in which each item has an equal
and independent chance of being chosen; e.g., a sample chosen to determine
(within definied limits) the average characteristics of an orebody.
AGI
The setting of diamonds in a bit crown without regard to the attitude of
their vector properties. Syn:random orientation
See also:random pattern
A term applied by quarry personnel to quarried blocks of any dimensions.
A system of molding in which the molds are made of a mixture of silica
sand and cement with water added. Osborne
a. In the CIPW classification of igneous rocks, that division below order.
b. A Ceylonese term for gold; from rangwelle meaning golden sand.
a. An area in which a mineral-bearing formation crops out; e.g., the iron
range and copper range of the Lake Superior region; a mineral belt.
AGI
b. An established or well-defined line or course whose position is known
and along which soundings are taken in a hydrographic survey. AGI
c. Any series of contiguous townships (of the U.S. Public Land Survey
system) aligned north and south and numbered consecutively east and west
from a principal meridian. AGI
d. The distribution of a genus, species, or other taxonomic group of
organisms through geologic time. AGI
e. An orderly arrangement or family of diamond-drill fittings, such as
casing, core barrels, drill rods, etc., with diameters appropriately
related to each other and intended to be used together. Ranges commonly
are designated by letter names, using letters such as E, A, B, and N
individually or as the first letter in two- and three-letter names.
CF:group
f. For a spherical model, the distance at which the model reaches its
maximum value, or sill. For the exponential and gaussian models, which
approach the sill asymptomatically, it means the "practical" or
"effective" range, where the function reaches approximately 95% of the
maximum. The nugget model effectively has a sill with a range of zero: the
linear model uses "sill/range" merely to define the slope.
One of the imaginary boundary lines running north and south at six-mile
intervals and marking the relative east and west locations of townships in
the U.S. public-land survey; a meridional township boundary line.
CF:township line
The range between the upper and lower limit of a cycle of stress, such as
is applied in a fatigue test. The midpoint of the range is the mean
stress. CTD
a. A 6- to 12-ft (2- to 3-m) wooden or metal pole painted in contrasting
colors at 1-ft (0.3-m) intervals. It is used in surveying to mark lines of
sight, stations, etc.
b. See:picket
c. A metal rod, pointed at one end, and usually painted alternately red
and white at 1-ft intervals; used by surveyors as a line of sight.
Syn:ranging rod
See:range pole
a. Describes the stage of carbonification attained by a given coal.
IHCP
b. The place occupied by a coal in a classification. Specifications of the
American Society for Testing and Materials cover the classification of
coals according to their degree of metamorphism, or progressive
alteration, from lignite to anthracite. For a complete description of this
classification, consult ASTM Designation: D 388. ASTM
c. When applied to coal, denotes its age in geological formation, not
necessarily denoting quality. BCI
d. The position of a coal relative to other coals in the coalification
series from brown coal (low rank) to anthracite (high rank), indicating
its maturity in terms of its general chemical and physical properties.
BS, 11
e. Those differences in the pure coal material due to geological processes
designated as metamorphic, whereby the coal material changes from peat
through lignite and bituminous coal to anthracite or even to graphite.
AGI
f. All coallike fossil fuels form a continuous and progressive series,
ranging from lignite, through the various bituminous coals, to anthracite.
It is the position of a particular coal in this series that determines its
rank. Therefore, lignite is a low-rank coal while anthracite is a
high-rank coal. See also:coalification; grade; Hilt's Law; coal rank.
Nelson
g. A term primarily devised to indicate the position of a fuel in the
series peat-anthracite, probably best measured by the percentage of carbon
(ashless, dry basis). Thus rank depends on the degree of metamorphism of
coal, and increase of rank is, in general, marked by the decrease of
volatiles and moisture. Tomkeieff
h. The term rank may also be applied to other series, such as the
sapropelic coal series or the bitumen series. CF:type
Tomkeieff
An absolute-temperature scale in which a measurement interval equals a
Fahrenheit degree and in which zero degrees is equal to -459.67 degrees F
(-273.16 degrees C). Named for William J.M. Rankine, a Scottish physicist.
See also:temperature
An empirical formula giving the collapsing load for a given column.
CTD
The state of stress theory as developed by Rankine in 1860 for application
to earth pressures. He formulated that the pressure on a vertical
retaining wall restraining earth with a horizontal surface is (1 - sinphi
) / (1 + sinphi ) multiplied by the soil density for each foot depth of
soil retained, where phi is the angle of internal friction of the soil.
The value (1 - sinphi ) / (1 + sin#2f) is the coefficient of active earth
pressure. Hammond
A monoclinic mineral, Ca3 Si2 O7 ; dimorphous with
kilchoanite; rare in contact metamorphic rock, but common in blast furnace
slag.
Variety in coals brought about as a result of progressive metamorphism.
More or less arbitrarily, although carefully, selected chemical criteria
are used to differentiate coals of different rank. Physical criteria are
also used but are more difficult of application. AGI
A monoclinic mineral, CuFe2 (SO4 )4 .6H2 O ;
forms slender sky-blue prisms; at Jerome, AZ.
a. To warn workers in an adjoining working place of a blast, when the
working places are separated by only a small pillar, by knocking on the
pillar with a tool or bar.
b. To test the roof by tapping it with a stick or bar.
c. To signal by knocking on a steam, water, or air pipe. Fay
A hornblende-biotite granite containing large rounded crystals of
orthoclase mantled with oligoclase. The name has come to be used most
frequently as a textural term where it implies plagioclase rims around
orthoclase in plutonic rocks.