In bituminous coal mining, one who inspects and checks portions of a mine
that have been leased to workers to see that the terms of lease, such as
mining within specified limits, safety precautions, and production rate,
are duly observed. DOT
In mining, one who checks, in the interest of miners, the weighing of coal
in mine cars or other containers by the company weighmaster. The person
estimates the amount of slate, dirt, rock, and other foreign matter in the
coal and sees that only authorized deductions are made. Also called
check-docking boss; check measurer; checkweighman; justiceman.
DOT; Fay
See:checkweigher
The removal of the side or sides of a roadway to increase its width.
TIME
a. The sides or walls of a vein. Fay
b. Extensions of the sides of the eye of a hammer or pick. Fay
c. The refractory sidewalls of the ports of a fuel-fired furnace.
Dodd
The compound formed by the combination of a chelating agent and a metal
ion. ASM, 1
A substance that contains two or more electron donor groups and will
combine with a metal ion so that one or more rings are formed.
ASM, 1
The reaction between a metallic ion and a complexing agent, generally
organic, with the formation of a ring structure and the effective removal
of the metallic ion from the system. It is significant in chemical
weathering. AGI
a. A ferruginous, nickeliferous, and slightly cupriferous smaltite.
See also:smaltite
b. A copper-bearing variety of smaltite.
An effective dichromatic color filter transmitting light of only two
wavelength regions--one in the deep red, the other in the yellow green.
Useful for discriminating between emerald and its imitations and for
detecting synthetic spinels and pastes colored blue with cobalt.
Anderson
A pale-yellow to dark-brown variety of retinite (amber) in decayed wood at
Cedar Lake, MB, Canada. Syn:cedarite
A method of breaking down coal similar to Hydrox and applied on the same
lines as air shooting. Nelson
Surface adherence, accompanied by the formation of primary bonds.
Van Vlack
a. The force that binds atoms together in molecules. CTD
b. The tendency of one substance to form a chemical compound with another.
Hess
A method of determining the composition of a material employing chemical
techniques by which the various elements are quantitatively separated.
A typical grout of this class used in Great Britain is bentonite-sodium
silicate, in which the silicate is used to render irreversible the
thixotropic nature of the bentonite suspension. The gel is stronger than
pure bentonite and is permanent, in that local vibration cannot cause it
to liquefy again. Setting time can be controlled by adjustment of the
chemical content. Nelson
Change in which permanent alteration of properties occurs, accompanied by
intake or release of energy. Reaction is governed by laws of mass
conservation, definite and multiple proportions, equivalence, and
volumetric reaction. Pryor, 3
The weight percent of the elements (generally expressed as certain oxide
molecules) in a rock. AGI
The elements or component parts of coal. These are determined by chemical
analyses that may be performed in different ways. An ultimate analysis
provides exact information as to the percentages of the various elements
(such as carbon, oxygen, and hydrogen) present in the coal. Another method
is by proximate analysis, which determines the relative percentages of
carbon, moisture, volatile matter (such as gas and tar), sulfur, and ash.
Nelson
The processes in which the salts or the soluble minerals in the Earth are
dissolved by water and carried to the sea. Bennett