a. The total ventilating pressure in a mine, usually measured in the fan
drift. Nelson
b. The algebraic sum of static pressure and velocity pressure at any
particular point. BS, 8
c. The pressure in a soil mass due to overlying material and any
superimposed loads. Nelson
d. The pressure on any horizontal plane in a mass of soil as calculated
from the weight of the material above the plane, or the soil together with
any applied loads. Hammond
In gemology and optical mineralogy, total reflection occurs in a
transparent solid where a light ray strikes the surface of a medium of
lower refractive index at any angle greater than its critical angle as
defined sin r = 1/n, where r is the critical angle and n is the refractive
index of the solid (or n2 /n1 , where n1 represents
the lower refractive index if other than 1 for air). CF:critical angle;
reflection; law of refraction.
An instrument for measuring the critical angle in a transparent solid.
The total resistance (R) or friction of a ventilation system is calculated
from the total ventilating pressure (P) and the total quantity of air at
the fan (Q). Thus: R= P/Q2 . Nelson
The total force per unit area acting within a mass of soil. It is the sum
of the neutral and effective stresses. ASCE
Tonnage of ore or product shipped plus tonnage of ore, waste, and tailings
dumped. Hoover
Value of ore or product shipped plus value of the ore, waste, and tailings
dumped. Hoover
The sum of the natural ventilating power plus the effective (or air)
horsepower of all fans in series. When the circuit is divided and fans are
in parallel, the total ventilating power of each split is worked out
separately, the natural and fan powers being added; finally the power of
each circuit is summed to give the total ventilating horsepower.
Spalding
The pressure required to overcome the static and potential energy head
losses and to provide the velocity head to move a quantity of air through
a network. See also:ventilating pressure; mine total head;
fan total head; water gage.
A test to determine the deviation of a well from the vertical, employing
an instrument known as a Totco. Williams
A black, flinty stone, such as a silicified shale or slate, or a variety
of quartz allied to chert or jasper, whose smoothed surface was formerly
used to test the purity or fineness of alloys of gold and silver by
comparing the streak left on the stone when rubbed by the metal with that
made by an alloy of predetermined composition. Syn:Lydian stone;
basanite. AGI
The exact state or quality of texture and consistency of refined copper.
See also:tough cake
Refined or commercial copper. See also:cake copper; tough. Fay
a. A property of a material that denotes, nominally, an intermediate value
between softness and brittleness. Tensile tests show a tough material to
have a fairly high tensile strength accompanied by moderate values of
elongation and reduction of area. Henderson
b. The amount of work required to deform a body to its rupture point.
AGI
The ratio between the index of plasticity and the flow index of a soil.
Hammond
Resistance to crumbling, to abrasion, or to coarse particles being
dislodged from the brick structure.
a. A term used in electrolytic copper refining to designate copper that
has set, from the molten condition, with a level surface.
See also:underpoled copper; overpoled copper. Fay
b. A term applied to copper in which the oxygen content has been correctly
adjusted at 0.03% to 0.06% by poling. Distinguished from overpoled and
underpoled copper. CTD
Copper containing from 0.02% to 0.05% oxygen, obtained by refining copper
in a reverberatory furnace. ASM, 1
Soft tenacious clay floor of coal seams. Arkell
A quarryman's term for the third easiest direction of rock fracture after
the rift and the grain. Syn:hard way
A work-shift. Sometimes incorrectly spelled tower. Long