The number of degrees through which the dipper or shovel bucket moves
horizontally from the filled position to the dumping position.
Carson, 1
An orthorhombic mineral, 4[PbSO4 ] ; sp gr, 6.2 to 6.4; in the
supergene parts of lead-ore veins; a minor ore of lead. Formerly called
lead vitriol, lead spar.
Horizontal angle measured clockwise from the preceding line to the
following one. Seelye, 2
A short curved section of a shaker conveyor trough inserted in a trough
line to change the angle of direction. Up to 15 degrees of turn, the angle
trough does not employ any means of support other than connection to
adjacent troughs. For a greater degree of turn, a fulcrum jack and a
swivel device are employed with the trough section. Jones, 1
Rope will only coil closely on the drum within the distance between the
centers of the pulleys. Spread or diagonal coiling will result outside
this distance unless the drum is grooved: this is known as outside angling
and with a grooved drum may amount to 1« degrees . After the normal line
between the pulley and the drum is passed, the coils attempt to get back
to this normal line. This produces friction crushing between the coils and
a danger of coils mounting one over the other; this is known as inside
angling and should be kept below 2 degrees . The amount of angling for a
given distance between the pulleys will depend upon the distance between
the headgear pulleys and the drum. Grooving the drum reduces the
difficulties associated with angling. Syn:outside angling
Sinclair, 5
See:angledozer
a. A unit of linear measurement in the centimeter-gram-second system. It
equals 10-10 m, 10-8 cm, 10-4 mu m, or 10
-1 nm. Such ultramicroscopic distances as the dimensions of atoms,
molecules, unit cells, and short wavelengths are expressed in angstroms.
Webster 2nd; Webster 3rd
b. Either of two units of wavelength: (1) 10-10 m, called the
absolute angstrom; or (2) the wavelength of the red spectrum line of
cadmium divided by 6,438.4696, which is called the international angstrom.
Webster 3rd
Having sharp angles or borders; specif. said of a sedimentary particle
showing very little or no evidence of abrasion. AGI
A milling cutter on which the cutting face is at an angle with regard to
the axis of the cutter. Crispin
See:slope test
An unconformity in which the older underlying strata dip at a different
angle (generally steeper) than the younger overlying strata.
See also:disconformity
Said of those minerals of igneous rocks that are not bounded by their own
crystal faces, but have an imperfect form impressed on them by the
adjacent minerals during crystallization. CF:euhedral; subhedral.
Syn:allotriomorphic; xenomorphic.
a. A compound formed from an acid by removal of water.
McGraw-Hill, 1
b. An oxide of a nonmetallic element or an organic radical, capable of
forming an acid by uniting with the elements of water, or of being formed
by the abstraction of the water, or of uniting with basic oxides to form
salts.
An orthorhombic mineral, CaSO4 ; massive; primarily in evaporite
deposits, hot sulfate volcanic waters, and veins; hydrates to gypsum.
Formerly called cube spar.
A sedimentary rock composed chiefly of anhydrite. AGI
Said of a substance, e.g., magma or a mineral, that is completely or
essentially without water. An anhydrous mineral contains no water in
chemical combination. AGI
Purified ammonia gas, NH3 , liquefied by cold and pressure.
See:xenomorphic
An approximate measure of the aromatic content of a mixture of
hydrocarbons. It is defined as the lowest temperature at which an oil is
completely miscible with an equal volume of aniline. Francis, 2
An orthorhombic mineral, Cu7 S4 ; alters to a digenitelike
crystal solution upon grinding.
A silver ore consisting of a mixture of sulfides, arsenides, and
antimonides, with striking intergrowths and in granular masses; contains
nickel and lead. CF:macfarlanite