A compact, nodular variscite from Lewiston, Cedar Valley, UT.
English
The vertical U-tube is the simplest type of pressure gage and consists
either of a single U-shaped glass tube having a uniform bore with vertical
arms or two separate glass tubes connected to a cistern. The level of the
liquid in the vertical U-gage can be read easily to 0.1 in (2.5 mm) and in
well-made instruments to 0.05 in (1.3 mm) water gage.
See also:manometer
An orthorhombic(?) mineral, (UO3 )2 V6 O15
.15H2 O(?) ; radioactive; brownish-yellow; in asphaltic sandstone
with carnotite, rauvite, hewettite, metatorbernite, hyalite, and gypsum;
from Utah; resembles carnotite.
An isometric mineral, Ca3 Cr2 Si3 O12 ; garnet
group; crystallizes in emerald green dodecahedra and trapezohedra; in
serpentinite and in skarns. Also spelled ouvarovite or uwarowit.
Syn:chrome garnet; chromium garnet.
The trigonal mineral, (Ca,Na)(Mg,Fe)3 Al5 Mg(BO3 )
3 Si6 O18 (OH,F)4 , of the tourmaline group.
See:uvarovite
See:volborthite
A point defect in a crystal structure where an atom or ion is missing from
its expected position. Syn:Schottky defect
As defined by its opposite, land is not vacant when occupied as a mining
claim without discovery by one who is diligently prospecting it for
minerals that it may contain. Ricketts
A numerical method used in gravity interpretation for calculating the
depth to the source of many typical total field anomalies. The method
involves the computation of the curvature of the observed total intensity
by superposition of a special grid over the intensity contours. The
curvature is proportional to the second vertical derivative of the
magnetic intensity. Dobrin
See:vesicle.
A method of producing ventilation by exhausting air from a mine.
See also:vacuum fan
a. The casting of metals in vacuum. Also called suction casting.
See also:vacuum metallurgy
b. Slip casting in which the slip is de-aired before casting.
VCF; evaporated salt made in vacuum pans; of ordinary purity and ordinary
screen analysis. Kaufmann
Concrete poured into a framework that is fitted with a linen filter in the
form of a vacuum mat. As a result of the process ensuing, the concrete
attains its 28-day strength in 10 days and has a 25% higher crushing
strength. Hammond
Condensation of thin metal coatings on the cool surface of work in a
vacuum. ASM, 1
A fan for creating suction or partial vacuum. An exhaust fan.
See also:vacuum
a. A form of filter in which the air beneath the filtering material is
exhausted to hasten the process.
b. One in which the pulp is drawn into contact with a porous septum by
means of a moderately high vacuum. Solids are arrested and filtrate drawn
through. In the drum and disc types, filtration is continuous. Vacuum is
produced by means of a pump. See also:pulp
a. The separation of solids from liquids by passing the mixture through a
filter and where, on one side, a partial vacuum is created to increase the
rate of filtration. It may be used to extract fine coal from the
suspension or cyanide solution for reuse. Nelson
b. See also:filter
Lifting by a crane fitted with a suction pad, employed for such items as
precast concrete components, large panes of glass, and sheet steel.
Hammond
The processing of metals at elevated temperatures, usually by induction
heating in high vacuum. See also:vacuum casting