A cameo produced by casting in a mold material such as ceramics, metals,
glass, plastics, or sealing wax. CF:pressed cameo
An obsolete term for decomposition of organic matter under conditions of
insufficient oxygen. AGI
A ruler, with measurements sufficiently elongated to compensate for the
heat expansion and contraction of a metal. Such rules are used in metal
casting to correct dimensions to normal temperatures. Bennett
a. The practice of pouring molten metal into suitable molds.
Hansen
b. The pressing of powder to form a compact. ASTM
A mixture of resins, ingredients, and fillers before processing into the
finished product. Jessop
A template to shape a loam mold. Standard, 2
An excavation in a foundry floor for large castings. Standard, 2
Derb. Weathered ore at the surface of an outcrop. Arkell
A truncated-cone-shaped refractory piece which sits in the bottom of an
ingot mold. AISI
a. A massive, solid-fill nearshore structure of earth, masonry, or large
stone that may serve as either a breakwater or a pier. Hy
b. An egg-shaped device pulled behind the tooth of a subsoil plow to open
drainage passages. Also called mole ball. Nichols, 1
c. Weight in grams of a compound in terms of its molecular weight.
Pryor, 3
Loosely bound aggregate of stable molecules; e.g., dry ice, solid iodine,
sulfur, paraffin, and most of the other crystalline organic solids.
Newton, 1
Using a porous membrane filter of very small openings, this sampler
achieves nearly 100% efficiency at moderate rates of flow. Membranes of
three different porosities are used to permit the sampling of dusts of
varying concentrations and particle sizes. Flow rate is controlled by the
use of calibrated orifices. Syn:membrane filter
A microporous structure of either crystalline aluminosilicates, such as
zeolites, or crystalline aluminophosphates, created by dehydration so that
the empty cavities in the structure where water molecules were previously
present will accept any material that can penetrate the cavity. The
sieving action is a function of the pore size of the structure.
a. The smallest part of a substance that can exist separately and still
retain its composition and characteristic properties.
b. The smallest combination of atoms that will form a given chemical
compound.
A method of working coal seams about 30 in (76.2 cm) thick, using a small
continuous miner type of machine, which is remotely controlled from the
roadway and without any associated supports. The machine is used to cut
and extract sections of coal about 6 ft (1.8 m) wide for a distance of 100
yd (91 m) or so from pillars alongside the roadway. Small ribs of coal, 3
to 6 ft (approx. 1 to 2 m) wide, are left between the sections extracted
by the machine. The accurate steering of the machine is a critical feature
of this system of mining. See also:coal auger
See:lamprophyllite
A deposit of diatomite of marine origin occurring on the island of Mors,
Denmark. It has been worked since 1912 for use as a heat insulating
material, as a constituent of special cements, and for other purposes.
Dodd
A waste product of smelting; usually a mixture of silicates. Kirk
An amorphous mineral, H4 U(UO2 )3 (MoO4 ) (sub
7) .18H2 O .
A hexagonal and trigonal mineral, MoS2 ; polymorphous with
jordisite; foliated; soft; metallic lead gray; an accessory in granites
and deep veins; an ore of molybdenum.
A silvery-white, very hard, metallic element. Symbol, Mo. Does not occur
native, but is obtained principally from molybdenite. Wulfenite (PbMoO
4 ), and powellite (Ca(MoW)O4 ) are also minor commercial
ores. Valuable as an alloying agent with steel and nickel. Used for
electrodes in electrically heated glass furnaces, in nuclear energy
applications, and for missile and aircraft parts.
Handbook of Chemistry and Physics, 3