See:inspector; mine inspector.
The psychrometric properties of air at given conditions, e.g., dry bulb
temperature, wet bulb temperature, and barometric pressure.
Hartman, 2
An apparatus that records automatically, in the form of a graph, the loss
of weight during the whole reduction of iron ores. Osborne
See:air mover
A structural frame in which the bending moments and reactions can be
determined by the laws of statics alone. Hammond
statically indeterminate frame
A redundant frame in which the bending moments and reactions cannot be
calculated from statical equations alone. See also:perfect frame
Hammond
A condition of rest created by inertia (dead weight) sufficient to oppose
outside forces. Nichols, 1
Is calculated in the same way as fan efficiency, but using a reading of
static pressure at some point instead of total pressure. Was formerly
widely quoted, and is still used to some extent, in relation to mine fans.
See also:fan efficiency
The electrode potential measured when no current is flowing between the
electrode and the electrolyte. Lowenheim
A grizzly in the form of a stationary bar screen, often improvised from
bars or rails set longitudinally, without cross bars. If used as a chute
it has a slope of 35 degrees to 45 degrees . It may allow suitable pieces
of coal or ore to pass over, and the unwanted small sizes drop through, or
it rejects oversize pieces while allowing suitable material to drop
through. See also:power grizzly
a. The height of a standing column of water as measured from the bottom of
a borehole upward. Sometimes expressed in units of weight as measured at
the bottom of the borehole. Long
b. In an air lift, the distance from the surface or top of the well casing
to the normal surface of the water when not pumping. Lewis
c. The sum of the suction and discharge heads. Carson, 1
d. See:hydrostatic head; static level.
The water level of a well that is not being affected by withdrawal of
ground water. AGI
a. The basal pressure exerted by the weight of a mass at rest, such as the
load imposed on a drill bit by the weight of the drill-stem equipment or
the pressure exerted on the rocks around an underground opening by the
weight of the superimposed rocks. Syn:dead load
b. A load that is at rest and exerts downward pressure only, such as a
hydrostatic load. Nichols, 1
A variety of regional metamorphism brought about by the action of heat and
solvents at high lithostatic pressures, not at pressures induced by
orogenic deformation. See also:load metamorphism
CF:thermal metamorphism
The static moment of a section about an axis, Y, is also termed the first
moment of the area about the axis. It is the sum of the products obtained
by multiplying each component of an area, A, by its distance, X, from Y.
See also:moment of inertia
A penetration test in which the testing device is pushed into soil with a
measurable force, as distinct from a dynamic penetration test in which the
testing device is driven into the ground by blows from a standard hammer.
See also:penetrometer; soil. Hammond
That branch of mechanics dealing with the relations of forces that produce
equilibrium among material bodies. Webster 3rd
A device giving contactless control of a circuit; e.g., a transistor,
thyratron, saturable reactor, etc. NCB
A static tube has a shaped, solid nose, on the downstream side of which a
number of small holes are positioned around the circumference. The holes
are so placed that the pressure in the tube is that of the undisturbed
airstream. Unlike the Pitot tube, the measured pressure is affected
considerably both by the position of the stem of the tube in relation to
the pressure holes, and by the distance between the holes and the nose
tip. The static tube is considerably more sensitive to yaw than is the
Pitot tube. See also:Pitot tube; Pitot-static tube. Roberts, 1
The level of water in a well or borehole when pumping is not in progress.
BS, 10
a. See:underground station; tank station.
b. A reference point in surveying, marked at the surface by a metal plate
set in concrete, or by a plug drilled into the roof of an underground
working. Pryor, 3
c. A length of 100 ft (30.5 m), measured along a given line, which may be
straight, broken, or curved. Seelye, 2
d. Any point on a straight, broken, or curved line whose position is
indicated by its total distance from a starting point, or zero point. For
example, station 4+47.2 identifies a point 447.2 ft (135.3 m) from the
starting point, the distance being measured along a given line.
e. A location on a conveyor system where bulk material is received or
discharged.
f. Any one of a series of stakes or points indicating distance from a
point of beginning or reference.
g. A setup point; i.e., a marked point on the ground, over which an
instrument is to be placed.