Alexandrite (chrysoberyl) of good gem quality from Tasmania, Australia.
An impure coal, transitional between cannel coal and oil shale.
Syn:combustible shale; yellow coal; Mersey yellow coal; white coal.
AGI
See:tasmanite
An orthorhombic mineral, Ca6 Mg2 (SO4 )2 (CO
3 )2 Cl4 (OH)4 .7H2 O ; with anhydrite
in saline strata of the Caspian depression.
Shrop. Fragile sandstone.
The tautline cableway differs from the aerial tramway in that its
operation is limited to the distance between two towers (not more than
3,000 ft or 915 m apart), it has only one carrier, and the traction cable
is reeved at the carrier so that loads can be raised and lowered. Also,
the tautline cableway is not restricted to a fixed position; the towers
can be mounted on trucks or crawlers, and the machine then can be shifted
across a wide area. The machine will hoist loads from any point under the
span, convey these loads in either direction, and lower these loads at any
point under the span. By using movable towers, an area of any length can
be traversed. Equipped with slings, this machine will pick up and carry
unwieldy loads of every kind; then by exchanging the slings for a skip, it
will handle large chunks of ore, stone, etc., or it can be equipped with a
dump bucket to handle any bulk material, including semifluid mixtures.
Pit and Quarry
Descriptive term for amphoteric substance, able to react in accordance
with two oppositely directed structural arrangements of its atoms.
Pryor, 3
An old name for an apatite mineral.
A triclinic mineral, LiFe(PO4 )(OH) ; amblygonite group; forms
green or yellow fine-grained aggregates; in Brazil.
A yellow to green to dark-green variety of epidote containing chromium;
occurs in Tawmaw, upper Burma (Myanmar).
Serpentine from Chester County, PA. Schaller
a. An obsolete name for bentonite; named after William Taylor who made the
first commercial shipments of the clay from the Rock Creek district,
Wyoming.
b. A variety of arcanite containing ammonium found in guano beds on
islands off Peru.
A furnace used for the manufacture of producer gas. Fay
A process for heat-treating high-speed steels. Webster 3rd
A bolt with a T-shaped head, made to fit into a T-shaped slot in a drill
swivel head; by means of it the swivel head can be turned to any angle of
inclination to drill a borehole. Also, a similar bolt made to fit into a
T-slot in the bed of a machine, for the purpose of holding a piece of
metal to be machined or to fasten a machine to its base. Long
a. An igniting stick used to light powder fuses when firing a round of
shots. Also called a fire stick. Pryor, 3
b. A paper shell about 1/4 in (0.64 cm) in diameter and 8 in (20.3 cm)
long, filled with a balanced combustible that gives a strong spitting
flame of 4 min duration. This device requires the individual lighting of
each fuse. Lewis
c. See:fuse lighter
A boring tool with its cut-edge made in the form of the letter T.
Fay
An orthorhombic mineral, (Pb,Sn)S ; perfect basal cleavage; soft; blackish
gray; sp gr, 6.4; in veins; a source of lead and tin.
A surface-set damond-bit crown molded in a die, prepared so that each
inset diamond is backed by a raised teardrop-shaped mound of matrix metal.
Long
A steep to vertical fault associated with a low-angle overthrust fault and
occurring in the hanging wall. It strikes perpendicular to the strike of
the overthrust; displacement may be horizontal, and there may be a scissor
effect. It is considered by some to be a type of strike-slip fault.
AGI
a. Ground easily broken and worked. Gordon
b. Corn. A lode or stratum that breaks easily by reason of many joint
planes. Fay