A three-legged support for a rock drill, hoisting drum, magnetometer, or
any other piece of equipment.
See:diatomite
A term that has been applied as a syn. of diatomite, in reference to the
material from the north African location of Tripoli. It has also been
used, less correctly, as a syn. of tripoli. See also:diatomite
AGI
a. A device in the run of a conveyor comprising two free drums around
which the belt passes S-fashion. Nelson
b. A device for discharging material from a belt conveyor. Nelson
c. A double pulley that turns a short section of a conveyor belt upside
down in order to dump its load into a side chute. Nichols, 1
d. A device or mechanism that trips, as a device for causing the load on a
conveyor to be discharged into a hopper or other receptacle.
Webster 3rd
e. An automatic car dump.
f. A device for tipping and dumping the skip at the top of the blast
furnace. Mersereau, 2
Person who unloads grain or ore from conveyor belt into bins or processing
equipment by operating a tripper. Syn:conveyor-operator tripper;
conveyor-tripper operator; spreader operator. DOT
a. The process of pulling and/or lowering drill-string equipment in a
borehole. Long
b. To open a latch or locking device, thereby allowing a door or gate to
open to empty the contents of a skip, bailer, etc. Long
A tetragonal mineral, CuAs+32 O4 ; excellent
prismatic cleavage permitting crystals to be broken into flexible fibers;
blue-green; at Atacama, Chile.
In bituminous coal mining, a laborer who switches cars to various tracks,
couples and uncouples trains, and attaches and detaches cars to and from
the haulage cable at a mine where there are several sidetracks on the
haulageway. DOT
A tetragonal mineral, FeSb2 O6 ; forms dull greenish-yellow
microcrystalline aggregates; in the cinnabar-bearing gravels of Tripuhy,
Ouro Preto, Minas Gerais, Brazil.
In metallurgy, a slag with a silicate degree of 3.
Newton, 1; Newton, 2
A screen in which each section of the deck is flatter than the preceding
one. The rate of feed is reduced on succeeding sections to maintain proper
bed depth for rapid stratification. It is designed for fine dry screening
of 3/4-in (19-mm) by 0-in, 1/2-in (13-mm) by 0-in, and 1/4-in (6 mm) by
0-in moist coal or other material. See also:varislope screen
Nelson
A crystal form of 24 faces in the isometric system with the gross
appearance of each face of an octahedron being replaced by three faces
arrayed around a diagonal triad. Each face of a trigonal trisoctahedron is
an isosceles triangle, while each face of a tetragonal trisoctahedron is a
trapezoid. Syn:trapezohedron
Na3 PO4 , a chemical compound used in some enamel frit
compositions. Enam. Dict.
a. An isometric hemihedron included under 12 trapeziform faces; a
tetragonal tristetrahedron. Standard, 2
b. An isometric hemihedron included under 12 isoceles triangular faces; a
trigonal tristetrahedron. Standard, 2
The radioactive isotope of hydrogen having two neutrons and one proton in
the nucleus. Being hydrogen-3, it is heavier than deuterium (heavy
hydrogen or hydrogen-2). Lyman; Handbook of Chemistry and Physics, 2
A trigonal mineral, (Ce,La,Y,Th)5 (Si,B,Al)3 (O,OH,F) (sub
13) (?) ; moderately radioactive; metamict; dark brown; in syenite with
leucophanite, analcime, mosandrite, aegirine, and catapleiite. Formerly
called spencite.
The number of grams of TNT required to produce the same angle of recoil of
the ballistic mortar as 10 g of the explosive under test.
McAdam, 2
a. A powder produced from a solid by grinding, usually with the addition
of some liquid. Gaynor
b. To grind to a powder, usually with the addition of some liquid.
Gaynor
Reduction to a fine powder by grinding. Syn:comminution
CF:levigation
a. Having a valence of 3. Webster 3rd; Standard, 2
b. Having three valences; e.g., chromium, which has valences of 2, 3, and
6. Syn:tervalent