Grinding mill in which spring-loaded rollers bear against a horizontal
rotating bowl--developed for coal pulverization. Pryor, 3
a. Negatively charged particles which leave the cathode in an evacuated
tube at between 10,000 mi/s and 90,000 mi/s (approx. 16,000 km/s and
144,000 km/s), depending on voltage. Positive rays are gas ions (e.g., N
+ , O+ ). X-rays are electromagnetic waves which travel
at the velocity of light and are not deflected by magnetic fields. Length
between 0.1 and 100 Aa (visible light lies between 4,000 and 8,000 Aa).
Short X-rays are soft and long ones are hard. Rays emitted by radioactive
substances are of three types, alpha, beta, and gamma. Alpha rays consist
of He++ and move at some 10,000 mile/s (approx 16,000 km/s). Beta
rays are electrons with speeds between 50,000 mi/s and 180,000 mi/s
(approx. 80,000 km/s and 288,000 km/s); gamma rays are not charged. They
move at the speed of light, but are shorter than X-rays (0.01 to 1 Aa).
Pryor, 3
b. In wave propagation a ray is the trajectory that a signal travels from
the source to another point (location).
A kind of rubble work; in the United States, any rubble work of thin and
small stones.
A sharp, narrow ridge, resembling the back of a razorback hog. AGI
A narrow saw used in excavating limestone. Webster 3rd
See:novaculite
a. An arm of the sea extending up into the land; e.g. an estuary or bay.
AGI
b. A continuous and unbroken expanse or surface of water or land.
AGI
c. An unstated but specific distance; an interval. AGI
d. The length of a channel, uniform with respect to discharge, depth,
area, and slope. AGI
e. The length of a channel for which a single gage affords a satisfactory
measure of the stage and discharge. AGI
f. The length of a stream between two specified gaging stations.
AGI
g. A relatively long, straight section of water along a lake shore; also,
a narrow arm of a lake, reaching into the land. AGI
h. A straight, continuous, or extended part of a stream, viewed without
interruption (as between two bends) or chosen between two specified
points; a straight section of a restricted waterway, much longer than a
narrows. AGI
The part of the impedance of an alternating-current circuit that is due
either to capacitance or inductance or to both and that is expressed in
ohms. Webster 3rd
See:reaction rim; corona.
See:cotectic line
See:cotectic line
Any two minerals, one of which crystallizes at the expense of the other by
reaction with a melt; esp. two adjacent minerals in a reaction series.
A relationship between liquid and crystals during crystallization, esp.
during fractionation, whereby crystals and liquid change composition in
response to changing temperature and pressure. CF:reaction series
A rind of one mineral surrounding another and presumably crystallized by
reaction of the core mineral with surrounding fluids.
CF:corrosion border
The sequence of minerals produced by reaction between liquid and crystals
during crystallization of a complex magma. Bowen's reaction series has a
continuous side (calcic to alkalic plagioclase) and a discontinuous side
(olivine-pyroxene-amphibole-biotite).
In explosives, the distance that detonation advances before the products
of combustion expand by an appreciable percentage. Leet, 2
Readily susceptible to chemical change. Osborne
Substance, solution, or gas susceptible to chemical change, or used in
influencing such change. Pryor, 3
The silica, SiO2 , present within various clay minerals occurring
in bauxite. During the Bayer process digestion of bauxite, this silica
reacts with comparable amounts of alumina to form insoluble sodium
aluminum silicate, which is lost as refinery plant residue.
a. A measure of ease of ignition and response to the controls varying the
rate of burning. It is used particularly in connection with fuels for
transport gas producers and low volatile fuels used for open fires.
Nelson
b. An assessment of the speed of reaction of a coal with oxygen under
specified conditions. BS, 4
As used in geochemical prospecting, refers to the content of a metal that
can be extracted from weathered rock, overburden, or stream sediment, by
weak chemical reagents. Syn:cold-extractable metal