See:balas ruby
A pale rose-red or orange variety of spinel in Badakhshan (Balascia)
Province of northern Afghanistan. Syn:balas; ballas; false ruby.
A belt with normal multi-ply construction, and in which balata is used to
impregnate the plies and provide cover. It cannot be used in high
temperatures but possesses a very high resistance to water absorption and
is thus well suited for wet conditions. Nelson
Electrolytic separation of gold from silver, using the alloy as anode,
graphite plate cathodes, and silver nitrate solution as bath.
Bennett
Without framing; said of a mine timber that has a flat end.
An anticline whose crest has been eroded prior to deposition of an
unconformably overlying sedimentary unit. CF:breached anticline
AGI
See:ballistite
a. Eng. A provincial name given to an impure stratified limestone.
Fay
b. Sandstone used for whetstone. Also called balkerstone. Arkell
a. A rounded mass of spongy iron, prepared in a puddling furnace; a loup.
Fay
b. A mass of tempered fire clay, used for forming the crucible in
crucible-steel production. See also:ballstone
A borehole-reaming device consisting of a bit attached to a
ball-and-socket or a knuckle-joint member, that in turn is connected to
the drill rods and used in borehole-deviation drilling. Also called arc
cutter. Long
A deep well pump valve in which a ball fits into a seat and prevents the
backflow of oil or water. Each standing valve and each traveling valve has
a ball and seat. Hess
a. A hard, spherical aggregate of many very small diamond crystals,
usually cryptocrystalline, arranged radially and more or less
concentrically around a central point. Because of their structure, ballas
are classed as industrials that are occasionally used in diamond-drill
bits and other diamond tools. See also:shot bort
b. A dense, globular aggregate of minute diamond crystals, having a
confused radial or granular structure lacking through-going cleavage
planes, giving it a toughness that makes it useful as an "industrial
diamond". CF:bort; carbonado.
c. A term incorrectly applied to a rounded, single crystal of diamond.
d. See:balas ruby
a. Broken stone, gravel, water, or other heavy material used to provide
weight in a ship or other machine and therefore improve its stability or
control its draft. Jettisoned ballast may be found in samples of marine
sediments. AGI
b. Gravel, broken stone, expanded slag, or similar material used as a
foundation for roads, esp. that laid in the roadbed of a railroad to
provide a firm bed for the ties, distribute the load, and hold the track
in line, as well as to facilitate drainage. AGI
A freight car (as for carrying ballast) that may be unloaded from the side
or bottom. Webster 3rd
A steam engine used in excavating and for digging and raising stones and
gravel for ballast. Webster 3rd
A spoon-pointed iron shovel having a thick body. Standard, 2
A friction-reducing device consisting of hard steel balls in a circular
race; also applied to some pieces of equipment, such as a swivel-type
double-tube core barrel, in diamond drilling using ball bearings as
load-bearing members on rotating parts. See also:bearing
a. See also:ball sizing
b. Removing burrs and polishing small stampings and small machined parts
by tumbling. ASM, 1
A highly plastic, sometimes refractory clay, commonly characterized by the
presence of organic matter, having unfired colors ranging from light buff
to various shades of gray, and used as a bonding constituent of ceramic
wares; pipe clay. It has high wet and dry strength, long vitrification
range, and high firing shrinkage. Ball clay is so named because of the
early English practice of rolling the clay into balls weighing 30 to 50 lb
(13 to 22 kg) and having diameters of about 10 in (25 cm). AGI
White sand with large spheroidal masses of calciferous sandstone called
sand ballers or giants' marbles, some being 3 to 6 ft (approx. 1 to 2 m)
in diameter. (Possibly a variant of "bollars," a dialect form of
boulders.)
A pulverizer or disintegrator consisting of metal balls enclosed in a
rotating cylinder. Fay