A wrench that has a smooth segmented sleeve that when tightly clamped
around the tube of a core barrel, will not mar or distort the thin tube
when the core barrel is taken apart. Long
An agitator using a number of small airlifts disposed about a circular,
flat-bottomed tank in such a way as to impart a circular swirling motion
to the pulp. Liddell
The simplest method for determining the amount of mineral matter present
in a coal is to determine the ash and sulfur contents and to make
corrections for the changes taking place in these during combustion. The
Parr formula for doing this is: total inorganic matter=moisture+1.08
ash+0.55 sulfur, where moisture, ash, and sulfur represent the percentages
of these substances found by analysis of the coal. Francis, 1
Long arm made of a flexible board for the suspension of a shaker screen.
Zern
A screening shaker with flexible wooden hangers and flexible drive arms;
used for sizing anthracite. Mitchell
A classification system based on the proximate analysis and calorific
value of ash-free, dry coal. The heating value of raw coal is obtained,
and from these data a table is drawn up, at one end of which are the
celluloses and woods of about 7,000 Btu/lb (16.3 MJ/kg). These data are
then plotted against the percentage volatile matter in unit coal.
Hess
A triclinic mineral, Pb2 (UO2 )(PO4 )2 .2H
2 O ; forms pale citron-yellow crusts, powders, and tiny laths;
nonfluorescent; radioactive; a secondary mineral in uraniferous pegmatites
and other uranium deposits.
In founding, a section of a mold or flask specif. distinguished (in a
three-part flask) as top part, middle part, and bottom part.
Standard, 2
A miner employed at an underground coal mine or at a surface work area of
an underground coal mine who has exercised the option under the old
section 203b program (36 FR 20601, October 27, 1971), or under 90.3 (Part
90 option; notice of eligibility; exercise of option) of this part to work
in an area of a mine where the average concentration of respirable dust in
the mine atmosphere during each shift to which that miner is exposed is
continuously maintained at or below 1.0 mg/m3 of air, and who has
not waived these rights. CFR, 1
Either of two stages of blasts when the height of the rock face is too
great to blast in one operation. McAdam, 2
An end support to a beam or a column that cannot develop the full fixing
moment. Hammond
a. Melting of part of a rock; because a rock is composed of different
minerals, each with its own melting behavior, melting does not take place
at one temperature (as for ice at 0 degrees C) but takes place over a
range of temperatures; melting starts at the solidus temperature and
continues, nonlinearly, as the temperature increases to the liquidus
temperature when the rock is totally molten. Fowler
b. A situation in which only certain minerals in a rock are melted, due to
their lower melting temperature.
a. That part of the total pressure of a mixture of gases contributed by
one of the constituents. Strock, 2
b. See:Dalton's law
Blast furnace smelting of copper ores in which some of the heat is
provided by oxidation of iron sulfide and some by combustion of coke.
See also:pyritic smelting
Roasting carried out to eliminate some but not all of the sulfur in an
ore. CTD
Any amount of subsidence that is less than full subsidence; such as with
solid or strip packing. Nelson
A general term, used without restriction as to shape, composition, or
internal structure, for a separable or distinct unit in a rock; e.g., a
sediment particle, such as a fragment or a grain, usually consisting of a
mineral. AGI
The length of a straight line through the center of a sedimentary particle
considered as a sphere; a common expression of particle size.
See also:particle size
See:particle size
The general dimensions (such as average diameter or volume) of the
particles in a sediment or rock, or of the grains of a particular mineral
that make up a sediment or rock, based on the premise that the particles
are spheres or that the measurements made can be expressed as diameters of
equivalent spheres. It is commonly measured by sieving, by calculating
settling velocities, or by determining areas of microscopic images.
See also:particle diameter
Determination of the statistical proportions or distribution of particles
of defined size fractions of a soil, sediment, or rock; specif. mechanical
analysis. Syn:size analysis