Half-cell used to measure electromotive force; potential being that of
mercury and mercurous chloride in contact with saturated solution of
potassium chloride. Used in pH measurement. Pryor, 3
See:calomel
The phenomenon of glowing when a substance is stimulated by heat rays that
lie beyond the red end of the visible spectrum.
See also:thermoluminescence
The gram calorie (or small calorie) is the quantity of heat required to
raise the temperature of 1 g of water from 15 to 16 degrees C. The mean
calorie is one-hundredth part of the heat required to raise 1 g of water
from 0 to 100 degrees C. CF:heat unit
The temperature of a fuel attained by its combustion. Newton, 1
The quantity of heat liberated when a unit weight or a unit volume of a
fuel is completely burned. Newton, 1
See:gross calorific value; net calorific value.
Any apparatus for measuring the quantity of heat generated in a body or
emitted by it, such as by observing the quantity of a solid liquefied or
of a liquid vaporized under given conditions. Used in determining specific
heat; latent heat; the heat of chemical combinations; etc.
Standard, 2
A place at the surface of a mine where drained combustible gases are
monitored or their heat content is ascertained. BS, 8
A process of rendering the surface of steel or iron resistant to oxidation
by spraying the surface with aluminum and heating to a temperature of 800
to 1,000 degrees C. CTD
An orthorhombic mineral, Cu(OH,Cl)2 .2H2 O ; in azure-blue
spherules and sheaves of scales having good basal cleavage; at the Calumet
Mine, Calumet, MI. Named from the locality. CF:anthonyite
The friable residue (as a metal oxide) left when a mineral or metal has
been subjected to calcination or roasting; e.g., lime from calcium
carbonate. Webster 3rd
a. A steel tube attached to the upper end of a core barrel and having the
same outside diameter as the core barrel. The upper end is open except for
two web members running from the inside of the tube to a ring encircling
the drill rod. The calyx serves as a guide rod and also as a bucket to
catch cuttings that are too heavy to be flushed out of the borehole by the
circulation fluid. Syn:bucket; sludge barrel; sludge bucket.
Long
b. Syn:shot drill
c. A pipe or tube equipped with a sawtooth cutting edge, sometimes used to
obtain a core sample of a formation being drilled. CF:basket
Long
d. In well drilling, a long cylindrical vessel that guides an annular
toothed bit. Its action is like that of a diamond drill. A toothed cutter
takes the place of a diamond crown and is rotated by hollow flushing rods
with a strong constant flow of water. A core is cut, preserved in a core
barrel, and brought to the surface. The drills are made large enough so
that the holes are used as shafts. Hess
e. See:sediment tube
a. The process of drilling with a shot drill. Long
b. The hole or core produced by this process. Long
A rotary core drill that uses hardened steel shot for cutting rock, which
will drill holes from diamond-drill size up to 6 ft (1.8 m) or more in
diameter. Drilling is slow and expensive, and holes cannot be drilled more
than 35 degrees off the vertical, as the shot tends to collect on the
lower side of the hole. Also called shot drill. See also:core drill
Lewis
A beam, bar, or girder bent like a bow, with the hump towards the strata.
Mason
The oldest of the systems into which the Paleozoic stratified rocks are
divided; also, the corresponding oldest period of the Paleozoic era.
Fay
A miner's term sometimes applied to such structures as bells, pots, kettle
bottoms, or other rock masses that tend to fall easily from a mine roof.
See also:pot bottom; tortoise. AGI
Mirror or prism attached to the eyepiece of a microscope, enabling an
observer to sketch the object displayed. Pryor, 3
A side-jerk concentrating table similar to the Wilfley table. Hess
The substitution for a common element in a crystal lattice by a trace
element of the same valence. CF:admittance; capture. AGI