A type of seismic survey based on measurement of the travel times of waves
that originate from an artificially produced disturbance and are reflected
back at near-vertical incidence from subsurface boundaries separating
media of different elastic-wave velocities. CF:refraction shooting
AGI
A wave that is propagated backward through the burned gas as the result of
an explosion wave being completely or partly arrested against the closed
extremity, or in a constricted portion of its path, as in a tube, gallery,
etc. Fay
The ratio of radiant energy reflected by a body to that falling upon it.
Strock, 2
The deflection of a ray of light or of an energy wave (such as a seismic
wave) due to its passage from one medium to another of differing density,
which changes its velocity. CF:reflection; diffraction. AGI
A seismic method of geophysical prospecting.
See also:refraction shooting
a. The detonation of heavy charges of explosive in comparatively shallow
holes or pits. The effects may be measured over a wide area. The firing
creates the shock waves in the seismic method of prospecting.
Nelson
b. A type of seismic survey based on the measurement of the travel times
of seismic waves that have traveled nearly parallel to the surface of
high-velocity layers, in order to map such layers.
See also:isochrone lines
See:index of refraction; dispersion.
a. A combustible gases detector. See also:interference methanometer
Nelson
b. An instrument for measuring indices of refraction of transparent
substances, both liquid and solid. CF:Abbe refractometer
The capacity of a material to resist high temperature. In the refractories
industry, the pyrometric cone equivalent (PCE) is a comparative value used
to determine the refractoriness of a material. Henderson
a. Said of an ore from which it is difficult or expensive to recover its
valuable constituents. AGI
b. Exceptionally resistant to heat. AGI
c. A nonmetallic material suitable for use in high-temperature
applications. AGI
High-temperature bonding mortars containing various materials and
exhibiting various properties, but primarily intended for providing
structural bond between refractory units in high-temperature industrial
furnace construction. Henderson
a. A brick made from refractory material, such as fire clay, bauxite,
diaspore, etc., used to withstand high temperatures. Refractory bricks are
made in various sizes and shapes.
b. A brick used as a lining for the interior of fireboxes in furnaces and
boilers. Refractory brick is constructed so that it can withstand very
high temperatures, but it is not a very good insulator. API, 1
See:fireclay
A lining that has high refractory qualities and is therefore suitable for
furnace linings and boiler foundations. It is made from a good-quality
refractory ore, clay, fireclay, or gannister. Nelson
A material able to withstand high temperatures and, therefore, used in
such applications as lining furnaces.
Ore difficult to treat for recovery of the valuable substances.
AGI
Consists of sandstone, quartzite, mica schist, soapstone, or other rock
that will withstand a moderately high temperature without fusing,
cracking, or disintegrating. It may be used in solid blocks or crushed and
mixed with a binder to form bricks. USBM, 7
Usually hollow ware, such as, saggers, pyrometer tubes, crucibles, etc.;
also refractory brick and shapes.
In mining, training given to all miners at least once a year consisting of
8 hours of instruction reviewing the essentials of new miner training.
CF:new miner training; task training. Federal Mine Safety
A substance that will absorb heat while vaporizing and whose boiling point
and other properties make it useful as a medium for refrigeration.
Strock, 2