A numerical quantity used as an index to characterize the type of flow in
a hydraulic structure in which resistance to motion depends on the
viscosity of the liquid in conjunction with the resisting force of
inertia. It is the ratio of inertia forces to viscous forces, and is equal
to the product of a characteristic velocity of the system (e.g., the mean,
surface, or maximum velocity) and a characteristic linear dimension, such
as diameter or depth, divided by the kinematic viscosity of the liquid;
all expressed in consistent units in order that the combinations will be
dimensionless. The number is chiefly applicable to closed systems of flow,
such as pipes or conduits where there is free water surface, or to bodies
fully immersed in the fluid so the free surface need not be considered.
AGI
In paper-strip chromatography, ratio of distance moved by component in
solution under test to that of transporting solvent. Pryor, 3
See:schreibersite
A form of dowsing using a rod or twig. CF:dowsing
a. A hexagonal mineral, (Ce,La,Nd)PO4 .H2 O ; speciated on
the basis of predominance of cerium, lanthanum, or neodymium; Also spelled
rhabdophanite.
b. The mineral group brockite, grayite, ningyoite, rhabdophane-(Ce),
rhabdophane-(La), rhabdophane-(Nd), and tristramite.
a. A substance below its melting point that deforms by viscous flow during
the time of applied stress at an order of magnitude at least three times
that of the elastic deformation under similar conditions.
b. A body of rock showing flow structure.
Folding accompanied by slippage along shear planes at an angle to the
bedding or older foliation.
The capacity of material to flow within the earth. AGI
A combination of the Hasenclever and O'Hara furnaces, with four hearths,
and with a combination flue under the lowest hearth and one over the upper
hearth. It has mechanical rabbles. Fay
A zinc distillation furnace that is a modified type of the Silesian
furnace. Fay
A rare, silvery-white metal. Symbol, Re. Occurs in very small quantities
in platinum ores and in columbite, gadolinite, and molybdenite. Used for
filaments for mass spectrographs and ion gages; for thermocouples and
photoflash lamps. Handbook of Chemistry and Physics, 3
A washer wherein raw coal and water is fed into the head of an inclined
trough equipped with openings in the bottom for the discharge of rejects.
There are three types of Rheolaveurs used in coal washing: (1) the sealed
discharge type for coarse sizes, from which the reject falls against an
upward current of water and is removed by an automatic gate that controls
the feed to a drowned elevator; (2) a system of two, three, or four
superimposed troughs for washing fine coal below about 1/2 in (1/3 cm).
The troughs are equipped with several bottom discharge devices. The
separation of the heavy shale from coal and middlings takes place
progressively until finally the pure shale is discharged from the lowest
trough, and (3) a system for washing slurry consisting usually of two
troughs one above the other and equipped with a number of Rheo boxes of
the open discharge type but designed to minimize the loss of coal with the
fine shale. Nelson
Study of the flowage of materials, particularly plastic flow of solids and
flow of non-Newtonian liquids. AGI
The process by which a rock becomes mobile and deforms viscously as a
result of at least partial fusion, commonly accomplished, if not promoted,
by addition of new material by diffusion.
a. An instrument for testing blasting machines by inserting definite
resistance equal to a known number of electric blasting caps of a
standard-length wire, using one electric blasting cap as an indicator.
b. An instrument by which a variable or an adjustable resistance may be
introduced into a circuit to regulate the strength of a current, as in the
field coils of a motor or a generator. Standard, 2
A small rope consisting of 8 strands of 7 wires each. Hunt
a. Quartz and other material cut to imitate diamond.
b. Glass backed with a thin leaf of metallic foil to simulate a diamond.
c. Originally a syn. of quartz crystal.
d. Cut colored glass.
An orthorhombic mineral, (Ca,Na2 ,K2 )8 Si16 O
40 .11H2 O ; fibrous; resembles zeolites; at Bultfontein
Mine, Kimberley, South Africa. See also:mountainite
See:rhodium gold
a. An element of the platinum group, Symbol: Rh.
b. An isometric mineral, RhPt .
Native gold alloyed with rhodium.