Plain-faced drum without grooves. Hammond
York. A smooth plane of cleavage. See also:bright head
Trowel used by plasterers and cement workers for finishing surfaces.
Crispin
A crusher in which the material passes between a moving set of rolls with
smooth surfaces. See also:roll
S.M.R.E. combustible gases recorder
This methane recorder is a combination of the principles used in the
Ringrose and McLuckie detectors. Two combustion chambers are used, each of
which operates every 6 min, the operation being staggered so that 20
determinations are made per hour. Samples are drawn into the instrument by
means of an electrically driven pump, the operation of the pump and the
combustion filaments being controlled by cams on a shaft driven by the
motor. Pressures are measured by an aneroid cell and recorded on a
clockwork driven drum. Roberts, 1
a. Soft, inferior coal.
b. S. Staff. Bad, soft coal, containing much earthy matter.
See also:muck
c. Coal smuts. CTD
d. Worthless outcrop material of a coal seam. CTD
e. Poor, dull, sooty portions of a coal seam. Gordon
f. A reaction product sometimes left on the surface of a metal after a
pickling or etching operation. ASM, 1
Lead ore that has been stamped or pounded down to a sand or powder to
remove rock and earth from the ore. Hess
A trigonal mineral, (Fe,Ni)9 S11 or (Fe,Ni)13 S (sub
16) ; physical properties are almost identical with monoclinic pyrrhotine.
A boat equipped with a hoist and grapple for clearing obstacles from the
path of a dredge. Nichols, 1
A method of boxing core. Beginning in the upper-right-hand corner of the
core box the core is run from right to left in the first row, from left to
right in the second row, left to right in the third, etc., until the box
is filled. CF:reverse book fashion
a. A borehole driven horizontally or nearly so and approx. on a level with
the quarry floor.
b. A borehole driven under a boulder for containing a charge of
explosives. In quarry work, it is called a lifter.
c. Nearly horizontal holes drilled at the bottom of the face of a bench.
The holes are not quite horizontal but are inclined slightly downward so
the bottoms will be a few feet below grade. Lewis
d. A hole driven into a toe for blasting, with or without vertical holes.
Nichols, 1
a. A method of blasting boulders to break them up, by boring a hole under
a boulder and firing a charge in it; this is more efficient but slower
than using plaster shots. See also:plaster shooting
b. A horizontal bore on the quarry floor. Pryor, 3
c. Drilling under a rock or face in order to blast it. Nichols, 1
A line used to skid a drill rig from place to place using a block and
tackle or cable, one end of which is attached to a deadman and the other
wrapped around the hoisting drum. Long
A monthly statement by a coal company on which a crooked line in red ink
was drawn to show a miner's indebtedness. The company checked off rent,
supplies, and groceries, which often added up to more than a miner's
monthly earnings. Korson
a. The progressive sliding forward of an armored flexible conveyor, by
means of hydraulic rams, as the coal is removed by a cutter loader.
See also:self-advancing supports
b. Moving a drill rig by the use of its own cathead or hoist unit.
See also:bulldog
c. Towing a load with a long cable. Nichols, 1
d. Inserting a tow or hoist line under an object without moving the
object. Nichols, 1
A rivet having a hemispherical head. Hammond
a. A car coupler, trip rider, or brakeman.
b. See:grab sampler
a. A pulley in a case that can be easily fastened to lines or objects by
means of a hook, ring, or shackle. Nichols, 1
b. A single-rope sheave set in a housing provided with a latch link, which
can be opened for admission of a rope or line without the necessity of
threading the end of the rope through the block. Long
c. A block or sheave with an eye through which lashing can be placed for
fastening to a scaffold or pole. Hammond
d. A sheave in a case having a pull hook or ring. Nichols, 1
a. The latch or catch of a door. Webster 3rd
b. To lay (rubblework) with spalls and fragments to fill the interstices.
Webster 3rd
a. The concept that the ray path of sound or light undergoes certain
specific changes as it passes through different layers of water; the ratio
of the sine of the angle of incidence to the sine of the angle of
refraction is the same for all angles of incidence and is equal to the
index of refraction. Hy
b. Ordinary refraction where the index of refraction equals the sine of
the angle of incidence divided by the sine of the angle of refraction.
Syn:law of refraction