A timber used in making a crib.
A monoclinic mineral, FeAl(PO4 )(OH)2 .H2 O ; forms a
series with eosphorite.
A pale- to light-blue lapis lazuli from Chile. See:lazurite;
lapis matrix.
A mill having vertical rollers running in a circular enclosure with a
stone or iron base or die. There are two classes: (1) those in which the
rollers gyrate around a central axis, rolling upon the die as they go (the
true Chile mill), and (2) those in which the enclosure or pan revolves,
and the rollers, placed on a fixed axis, are in turn revolved by the pan.
It was formerly used as a coarse grinder, but is now used for fine
grinding. Liddell
An earthy, secondary lead, zinc, and copper vanadate; occurs near
Arqueros, Chile; related to psittacinite. See also:mottramite
An amorphous mixture(?) containing silver and bismuth.
A former name for nitratine.
a. A metal insert imbedded in the surface of a sand mold or core or placed
in a mold cavity to increase the cooling rate at that point.
ASM, 1
b. White iron occurring on a gray iron casting, such as the chill in a
wedge test. ASM, 1
c. To harden by suddenly cooling. Gordon
d. Derb. To test the roof with a tool or bar to determine its safety.
Fay
Pouring molten metal into molds so made that it comes into contact at
desired places with metal; cooling is thus accelerated, and special
hardness is imparted. Pryor, 3
Small crystal formed by the rapid freezing of molten metal when it comes
into contact with the surface of a cold metal mold. CTD
A casting made by contacting it with something that will rapidly conduct
the heat from it, such as a cool iron mold, or by sudden cooling by
exposure to air or water. Fay
That part of a mass of igneous rock, near its contact with older rocks,
that is finer grained than the rest of the mass, because it cooled more
rapidly. AGI
The condition of dynamite when subjected to a low temperature not
sufficient to congeal it, but which seriously affects the strength of the
dynamite. Fay
In hard-rock boring with an adamantine or Calyx drill, chilled iron or
steel pellets that are driven by the drill bit and do the actual abrasive
cutting. Pryor, 3
See:shot drill
A method of rotary drilling in which chilled steel shot is used as the
cutting medium. BS, 9
a. An ore shoot or pipe. See also:chute
b. A term used for limestone pinnacles bounding zinc ore deposits.
c. A vertical or nearly vertical staple shaft between a lower and an upper
coal seam.
d. An orebody that is roughly circular or elliptical in horizontal cross
section, but may have great vertical extent. Nelson
e. A restricted section in a lode; rising steeply and unusually rich.
See also:pipe
f. A cylindrical vent for volcanic rock. Standard, 2
See:stack effect
a. A column of rock standing above its surroundings, such as an igneous
rock filling a pipe-shaped vent.
b. Gulf States. A local name for any rock soft enough when quarried to be
cut or sawn readily and refractory enough for domestic chimneys, which may
harden on exposure to the air; e.g., some limestone, siliceous bauxite
clay, or soapstone. Hess
Mid. A system of working beds of clay ironstone in patches 10 to 30 yd
(9.1 to 27.4 m) square and 18 to 20 ft (5.5 to 6.1 m) thick. The bottom
beds are first worked out; then miners work the higher ones by standing
upon the fallen debris. CF:overhand stoping
A commercial term for kaolin obtained from china-clay rock after washing,
and suitable for use in the manufacture of chinaware. AGI