Independent movement through a limited range, usually on a hinge.
Nichols, 1
A thin slab of quartz which, by mechanical vibration, controls the
frequency of a radio transmitter. Hurlbut
Flawless quartz, which can be used in the manufacture of oscillator
plates.
Repeated twinning in which a crystal is made up of thin lamellae
alternately in reversed position; polysynthetic twinning; found in some
feldspars. Syn:polysynthetic twinning
Repetitious concentric compositional variation in minerals resulting from
cyclical changes in the chemical environment during crystal growth; e.g.,
garnet and plagioclase.
A record of phenomena observed on an oscillograph. ASM, 1
An instrument that renders visible, or automatically traces, a curve
representing the time variations of various phenomena. The recorded trace
is an oscillogram. AGI
An instrument for showing visual representations of electrical outputs
from measuring devices. Hunt
See:iridosmine
The native element, Os; occurs in magmatic deposits in mafic and
ultramafic rocks and placers derived from them.
The passage of a solvent through a membrane from a dilute solution into a
more concentrated one, the membrane being permeable to molecules of
solvent but not to molecules of solute. AGI
A massive, earthy mineral (apatite) consisting of an impure, altered
phosphate.
A minute crustacean with a bean-shaped bivalve shell completely enclosing
the body. AGI
A trigonal mineral, CdCO3 ; calcite group; associated with oxidized
base-metal ores.
As used in the Mining Law of 1872, means any rocky substance containing
mineral matter. Ricketts
Includes nonmetalliferous as well as metalliferous deposits.
Ricketts
A process that uses an inert heavy liquid with a specific gravity between
that of coal and free mineral matter to separate coarse or fine-size coal
in a static bath or cyclone separator.
A selective agglomeration process under development, in which ultra-fine
grinding of the feed coal to 15 mu m releases almost all the associated
impurities prior to agglomeration with a low-molecular-weight hydrocarbon.
The agglomerant is then recovered and recycled.
In a four-stroke internal combustion engine two complete revolutions of
the crankshaft correspond with the working cycle-inlet stroke (suction
downstroke of piston in cylinder); compression upstroke; explosion at peak
of compression followed by expansion of hot exploded gases on driving
downstroke; rising exhaust stroke to complete the cycle. Pryor, 3
See:novaculite
See:wadi