a. A certified employee is one who has been granted a State certificate of
competency for a given job. BCI
b. Evaluated and listed as permissible by the National Institute for
Occupational Safety and Health or the Mine Safety and Health
Administration. ANSI
A blaster certified by a government agency to prepare, execute, and
supervise blasting. Atlas
a. A trade name for a form of calcium carbonate colored green and blue by
malachite or azurite, and used as a gemstone. From Bimbowrie, south
Australia. English
b. A term used less correctly for a blue variety of satin spar.
A former name for connellite. Also spelled caeruleofibrite.
An orthorhombic mineral, 4[PbCO3 ] ; aragonite group; adamantine;
sp gr, 6.55; in oxidized and carbonated parts of lead-ore veins; a source
of lead. Syn:white ore; white lead ore; lead carbonate; lead spar.
An orthorhombic mineral, Sb3+ Sb5 O4 ; may be
confused with stibiconite.
A silvery white, soft and ductile alkaline element, of the rare-earth
metals. Symbol, Cs. Occurs in lepidolite and pollucite. Reacts explosively
with cold water. Because of its great affinity for oxygen, the metal is
used as a "getter" in electron tubes and as a catalyst in the
hydrogenation of certain organic compounds; it has recently found
application in ion propulsion systems.
Handbook of Chemistry and Physics, 3
An indication of diesel fuel ignition quality. The cetane number of a fuel
is the percentage by volume of cetane in a mixture of cetane and alpha
methylnaphthalene, which matches the unknown fuel in ignition quality.
American diesel oil usually ranges from 30 to 60 cetane.
Nichols, 1
Original spelling of ceylonite. See also:ceylonite
The trade name for a yellowish-green variety of tourmaline, approaching
olivine in color; used as a semiprecious gemstone.
Syn:peridot of Ceylon
A dark-green, brown, or black variety of spinel containing iron.
Syn:pleonaste; candite; ceylanite; zeylanite.
An angling bulldozer lift and push frame. Nichols, 1
A trigonal mineral, 1[Ca2 (Al4 Si8 O24 ).13H
2 O] ; zeolite group; pseudocubic cleavage; occurs in cavities in
basalts and hydrothermal veins and as alteration of silicic vitreous tuffs
in alkaline saline lake deposits.
See:xenocryst
a. A measuring instrument that consists of 100 links joined together by
rings and is used in surveying. See also:Gunter's chain
Webster 3rd
b. A unit of length prescribed by law for the survey of U.S. public lands
and equal to 66 ft (20.12 m) or 4 rods. It is a convenient length for land
measurement because 10 square chains equal 1 acre (0.4 ha). AGI
A combination of sheaves over which chains are arranged in the same manner
as the rope in a block and tackle. Also called chain hoist. Long
An underground inclined plane worked by an endless chain.
A dredger with a bucket ladder. Hammond
A mobile loader that uses a series of small buckets on a roller chain to
elevate spoil to the dumping point. Also called bucket loader.
Nichols, 1
See:chain guard
A coal cutter that cuts a groove in the coal by an endless chain traveling
around a flat plate called a jib. The chain consists of a number of pick
boxes. Each box holds a cutter pick fastened into the box by a set screw
or similar device. The coal cutter pulls itself along the face by means of
a rope at a speed ranging from 7 in/min (17.8 cm/min) to 5 ft/min (1.5
m/min) or more. The chain travels around the jib at a speed ranging from
320 to 650 ft/min (97.6 to 198.2 m/min). The cut in the coal ranges from
3-1/2 to 7-1/2 in (8.9 to 19.1 cm) high and up to 8-1/2 ft (2.59 m) in
length. See also:coal-cutter pick