See:roentgenite
A photograph made with X-rays. Syn:roentgenograph; radiograph.
Webster 3rd
See:roentgenogram
An automatic apparatus for discharging lead from the kettle; used in the
Parkes process. Fay
Wires suspended in a dust chamber to assist in settling and condensing
dust and fumes from furnace gases. Fay
A process for separating copper, and in part silver, from gold by fusing
with sulfur or with antimony sulfide, obtaining copper or silver sulfide.
Fay
A fine-grained oolite resembling the roe of a fish. See:oolite
Fay
An aqueous solution of mercuric barium iodide with a density of 3.5 g/cm
3 ; used for separating minerals by density.
A method that makes use of an airstream at a pressure of 4 atmospheres for
atomizing molten pig iron into minute particles. The molten metal falling
into an air stream formed by an annular slit in a steel cyclone is
atomized, the particles falling into a water bath and subsequently dried.
Osborne
An aqueous solution of mercuric barium iodide; clear, yellow liquid; very
refractive; sp. gr., 3.5. Used in separating minerals by their specific
gravity and in microchemical detection of alkaloids. CCD, 2
Prov. Eng. A vein of ore. A variation of rake. See:rake
a. An elongate protrusion of shale, siltstone, or sandstone (locally
limestone) from the roof into a coal seam, causing a thinning of the seam
and sometimes replacing it almost entirely. CF:cutout
commonly overlain by a thin coal stringer. AGI
b. An elongate upheaval of the floor material into a coal seam, causing
thinning of the seam. Syn:horseback
c. Various minor deformations or dislocations of a coal seam, such as
washouts, small monoclinal folds, or faults with little displacement.
AGI
d. In veins and other types of ore deposit, a thickening or an arcuate
change in dip in the orebody.
e. See:roll orebody
f. A rotating cylinder used to support or guide a portion of conveyor
belt.
g. One of two cylinders or grooved rollers between which material is
drawn, for reducing its thickness, as the finished rolls of a rolling
mill. BS, 11
h. The appearance of other types of mineral deposits in places where the
bed or vein thickens or thins. Mason
i. A roughly cylindrical distribution of uranium mineralization occurring
usually in the Salt Wash Sandstone. There is some question whether the
feature is structural or sedimentary.
j. An inequality in the roof or floor of a mine. NEMA, 1
k. S. Wales. The drum of a winding engine.
l. Cast-iron or steel cylinder, used to break coal and other materials
into various sizes. Applies to the type of crushing machinery in which the
ore or coal is broken between cylindrical rolls, either plain or fitted
with steel teeth, revolving toward each other, drawing the material in
between the crushing peripheries, which rotate in a vertical plane.
Fay; Liddell
m. In powder metallurgy, a machine used to apply pressure progressively to
form a compact. See also:crushing roll; ribbed roll; smooth roll; want;
washout. Rolfe
The progressive compacting of metal powders by the use of a rolling mill.
ASTM
A type of secondary or reduction crusher consisting of a heavy frame on
which two rolls are mounted. These are driven so that they rotate toward
one another. Rock fed in from above is nipped between the moving rolls,
crushed, and discharged at the bottom. See also:double-roll crusher
Newton, 1
Refers to metal, such as silver or stainless steel, which has been clad
with a precious metal and rolled to reduce the thickness of the coat.
USBM, 7
A thin plate of gold spread upon a layer of base metal by soldering the
metals in the bar and then rolling the whole out into plate, forming a
thinner plate of gold than that of the ware known as gold-filled. Also
called rolled gold. Fay
An I-beam made from a single piece of steel passed through a hot rolling
mill. Hammond
a. A broad pulley or wheel fixed to the floor, roof, or sides of roadways
to prevent a haulage rope running against the ground that would cause
excessive friction and wear of rails and sleepers. Nelson
b. A component part of a roller chain in which it may serve only to reduce
frictional loss occurring as the chain negotiates sprockets. Rollers may
also serve as the rolling support for the chain and the load being
conveyed.
c. A heavy vehicle used for compacting soil, earth fill, and top layers of
spoil dumps to increase the density and bearing capacity of the material.
Nelson
Hard steel cylinders in bearings that have very low frictional resistance.
Hammond
a. A rotary boring bit consisting of two to four cone-shaped, toothed
rollers that are turned by the rotation of the drill rods. Such bits are
used in hard rock in oil well boring and in other deep holes down to 5,000
m and more. See also:tricone bit; drag bit. Nelson
b. A type of rock-cutting bit used on diamond and rotary drills. The bit
consists of a shank with toothed, circular, or cone-shaped cutter parts
affixed to the head of the bit in such a manner that the cutters roll as
the bit is rotated. Generally used for drilling 10-cm-size or larger holes
in soft to medium-hard rocks, such as shale and limestone. Usually
noncoring and not diamond set. Also called cone bit. CF:noncoring bit
See also:rock bit; roller rock bit. Syn:roller cone bit;
roller-cutter bit; rolling cutter bit; toothed roller bit. Long
a. Generally, any sprocket-driven chain made up of links connected by
hinge pins and sleeves. Nichols, 1
b. Specif., a chain whose hinge sleeves are protected by an outer sleeve
or roller that is free to turn. Nichols, 1