A horizontal pipe for carrying live steam from a boiler to radiators, a
steam engine, or other steam consuming device. Crispin
See:point
An excavating machine in which a large dipper is operated by steam power.
Used for stripping purposes and in open-pit mining, esp. for iron and
coal. A similar shovel is now operated by electricity, gasoline, and
diesel engines. Standard, 2
An opencut mine in which steam shovels or other power shovels are used for
loading cars. Hess
A crushing machine consisting of a vertical stamp shaft that is forced
down to strike its blow, and lifted up preparatory to striking the next,
by a steam piston. Fay
A method of dredging permanently frozen ground in Alaska and the Yukon
Territory in which steam is forced through pipes that are fitted with
steel points on one end and a driving head on the other end so that the
pipes can be hammered into the frozen gravel. Thawing by steam is a slow
and costly process. See also:thawing
The most common type of steam winder is the two-cylinder double-acting
horizontal engine driving direct on the drum shaft. These engines, which
are made with cylinders up to 42 in (1.1 m) in diameter and with a 84-in
(2.1-m) stroke, possess the merit of simplicity and ease of control. The
two cylinders act on cranks set at 90 degrees to each other and are large
enough for either to start the engine from rest against a full load, since
one may happen to stop at dead center (i.e., with the piston at the end of
its stroke, in which position it can exert no turning moment on the
crank). Mason
A propeller or axial-flow fan developed by Steart in Australia.
See also:fan
a. A compact, massive, fine-grained, fairly homogeneous talc-rich rock.
b. Gray-green or brown massive impure talc that is carved easily into
ornamental objects. Syn:lardite; lard stone; soapstone; soap earth.
See also:talc
A relatively pure or high-grade variety of talc suitable for use in
electronic insulators, the purest commercial form of talc.
Syn:French chalk
Introduction of, alteration to, or replacement by, talc (steatite); esp.
the act or process of hydrothermal alteration of ultrabasic rocks that
results in the formation of a talcose rock (such as steatite, soapstone,
or relatively pure concentrations of talc). AGI
A delicate vertical-angle adjustment for the vernier on the alidade,
graduated in hundredths of a revolution. See also:gale alidade
CF:tangent screw
a. An iron-base alloy, malleable in some temperature range as initially
cast, containing manganese, usually carbon, and often other alloying
elements. In carbon steel and low-alloy steel, the maximum carbon is about
2.0%; in high-alloy steel, about 2.5%. The dividing line between low-alloy
and high-alloy steels is generally regarded as being at about 5% metallic
alloying elements. Steel is to be differentiated from two general classes
of irons: the cast irons, on the high-carbon side and the relatively pure
irons, such as ingot iron, carbonyl iron, and electrolytic iron, on the
low-carbon side. In some steels containing extremely low carbon, the
manganese content is the principal differentiating factor, steel usually
containing at least 0.25%; ingot iron contains considerably less.
ASM, 1
b. The borer, consisting of shank, shaft, and bit or cutting edge; used
for rock-drilling with drifters or jackhammers. CTD
c. In air hammers, the hollow or solid steel bar that connects the hammer
with the cutting tool. Nichols, 2
Curved length of steel, usually of H-section, used for supporting mine
roadways. Two-, three-, or four-segment arches are available, with
straight leg, splayed leg, horseshoe, or circular design; in double radius
or with welded baseplate. See also:Usspurwies arch;
Toussaint-Heintzmann arch; steel support; steel ring. Nelson
A belt of relatively thin carbon or stainless strip steel alloyed and heat
treated to withstand continued flexing over pulleys.
Thin, flat, steel belts ranging from 0.008 to 0.035 in (0.02 to 0.09 cm)
in thickness and from 7/8 to 8 in (2.2 to 20.3 cm) in width have been
successfully used. The pulleys should be faced with a thin layer of cork.
Steel belts can be run at speeds as high as 10,000 ft/min (3.0 km/min). It
has been claimed that a 4-in (10.2-cm) steel belt will transmit as much
power as a 19-in (48.3-cm) leather belt. Crispin
The cutting tool at the end of the drill steel. Various bit shapes are
used, the three commonest being the single chisel bit (used only for hand
drills); the double chisel bit (used for fairly soft rock), and the cross
bit (used for hard rock and for general purposes).
See also:tungsten carbide bit; chisel bit; cross-chopping bit.
Nelson
A youngster who carries drills to the miners, and collects dull drills and
sees that they are returned to the blacksmith shop. Fay
A flexible rope, the strands of which are steel wires. See also:cable
Long
A rubber conveyor belt in which the carcass is composed of a single plane
of steel cables that acts as a longitudinal tension-carrying member and
includes two or more plies of fabric to provide transverse strength and
hold the cables together.
A pipe to support the walls of a borehole in loose ground. The casing is
secured in position by a concrete block or by the cross beams of the
platform. It is driven down from the surface and follows the drilling
operation closely or sometimes even precedes the borehole in sand or very
loose ground. See also:borehole casing