A modification of the sulfuric acid parting process for bullion containing
large amounts of copper. A large excess of acid is used; the silver
sulfate is then reduced with charcoal, or, in the original process,
ferrous sulfate. Liddell
a. A wire line or rope attached to the top of a drill derrick or pole and
extending obliquely to the ground, where it is fastened to a deadman or
guy anchor. See also:guy line
b. A rope that holds the end of a boom or spar in place. Syn:guy rope
See also:guy line
The object to which the lower end of a guy is attached. Also called
deadman. Long
Held upright and steadied by one or more guys. Long
A guy or several guys. See also:guy
A flat-topped submarine mountain rising from the floor of the ocean like a
volcano but planed off on top and covered by an appreciable depth of
water. Leet, 1
A ring on the head block or top of a drill pole, derrick, or tripod to
which guys are attached. Long
a. A rope holding a structure in a desired position. CTD
b. See:guy
a. Massive rock gypsum.
b. A driller's term for a rock of any kind in which he has trouble in
making a hole. AGI
c. A rock composed chiefly of gypsum. AGI
Containing gypsum. Also spelled gypseous.
Development of, or conversion into, gypsum; e.g., the hydration of
anhydrite. AGI
See:gypsum
A monoclinic mineral, 8[CaSO4 .2H2 O] ; colorless to white
in crystals, but massive beds may range from red to yellow to brown, gray,
or black; the most common natural sulfate; defines 2 on the Mohs hardness
scale; commonly associated with rock salt (halite) and anhydrite; forms
beds and lenses interstratified with limestone, shale, and clay, esp. in
rocks of Permian to Triassic age; also in volcanic fumarolic deposits; an
accessory mineral in metalliferous veins. Syn:gypsite
In polarized-light microscopy, an accessory plate of clear gypsum
(replaced by quartz of the appropriate thickness in modern instruments)
that gives a first-order red (approx. 1 lambda out of phase for 560 nm)
interference color with crossed polars when inserted in the tube with its
permitted electric vectors at 45 degrees to those of the polarizer and
analyzer. It is used to determine fast and slow directions (electric
vectors) of light polarization in crystals under view on the microscope
stage by increasing or decreasing retardation of the light. Also called a
sensitive-tint plate. CF:accessory plate; quartz wedge.
See also:selenite plate
Heavy-duty fixed path cone crusher; a variant from the standard cone
crusher. See also:Symon's cone crusher
a. More or less eccentric, as certain rock crushers. von Bernewitz
b. A widely used form of rock breaker in which an inner cone rotates
eccentrically in a larger outer hollow cone. CTD
A primary crusher consisting of a vertical spindle, the foot of which is
mounted in an eccentric bearing within a conical shell. The top carries a
conical crushing head revolving eccentrically in a conical maw. There are
three types of gyratories--those that have the greatest movement on the
smallest lump, those that have equal movement for all lumps, and those
that have greatest movement on the largest lump. Syn:gyratory crusher
See also:cone crusher
See:gyratory breaker
a. A north-seeking form of gyroscope used as a vehicle's or craft's
directional reference. Also known as gyroscopic compass.
McGraw-Hill, 1
b. The gyrocompass is used in underground and borehole surveying.
Syn:gyroscopic compass; gyrostatic compass. AGI
A method for measuring borehole deviation that photographs time,
temperature, and inclination from the vertical on 16 mm film and can take
1,000 readings descending then ascending the hole as a check. The
gyroscope maintains the casing on a fixed bearing. Sinclair, 2
a. See:gyrocompass
b. A magnetic compass whose equilibrium is maintained by the use of
gyroscopes. AGI