a. A bulldozer whose blade can be turned at an angle to the direction of
travel. Carson, 1
b. A power-operated machine fitted with a blade, adjustable in height and
angle, used for digging and side casting, and for spreading loose
excavated material; used at opencast pits and dumping sites.
Nelson
c. A bulldozer with a blade that can be pivoted on a vertical center pin,
so as to cast its load to either side. Syn:angling dozer
Nichols, 1
See:inclined drilling; inclined borehole.
A borehole that is drilled at an angle not perpendicular to the Earth's
surface. Syn:incline hole
See:alidade
In mine fan terminology, the angle made by the direction of air approach
and the chord of the aerofoil section. Roberts, 1
In rolling metals where all the force is transmitted through the rolls,
maximum attainable angle between roll radius at the first contact and the
roll centers. If the operating angle is less, it is called the contact
angle or roll angle. ASM, 1
The angle at which strata or mineral deposits are inclined to the
horizontal plane. In most localities, earth movements subsequent to the
deposition of the strata have caused them to be inclined or tilted.
Syn:dip
a. In coal mine subsidence, this angle is assumed to bisect the angle
between the vertical and the angle of repose of the material and is 20
degrees for flat seams. For dipping seams, the angle of break increases,
being 35.8 degrees from the vertical for a 40 degrees dip. The main break
occurs over the seam at an angle from the vertical equal to half the dip.
Lewis
b. The angle between the limit line and the vertical. CF:draw
Nelson
The angle between the abscissa and the tangent of the curve representing
the relationship of shearing resistance to normal stress acting between
soil and the surface of another material. ASCE
In polarized-light microscopy, the angle between an extinction direction
and a crystallographic direction--e.g., crystal face, cleavage plane--of
an anisotropic mineral. An extinction angle of 0 degrees is called
"parallel extinction," an angle of 45 degrees "symmetrical extinction,"
other angles "oblique extinction;" of diagnostic value in mineral
identification. Syn:extinction angle
The angle between the perpendicular to a surface and the resultant force
acting on a body resting on the surface, at which the body begins to
slide. Hammond
The angle of slope from the horizontal.
In a rock-crushing machine, the maximum angle subtended by its approaching
jaws or roll surfaces at which a piece of ore of specified size can be
gripped. See also:nip
The angle between the direction of the resultant stress or force acting on
a given plane and the normal to that plane. ASCE
a. That angle, the tangent of which is the index of refraction of a
reflecting substance. Fay
b. The angle of reflection from a plane surface at which light is
polarized. Hess
The angle between the vertical and an inclined plane bounding the area
affected by the subsidence beyond the vertical. Applied to slides of
earth. Fay
a. The angle that a reflected ray of light, on leaving the exterior or
interior surface of an object, such as a transparent stone or crystal,
makes with the normal to that surface.
b. An erroneous term for the Bragg angle of X-ray diffraction.
See:angle of rest
The maximum slope at which a heap of any loose or fragmented solid
material will stand without sliding or come to rest when poured or dumped
in a pile or on a slope. Syn:angle of repose
See also:natural slope
The angle between the planes of maximum shear, which is bisected by the
axis of greatest compression. Rice, 1
The slope, measured in degrees of deviation from the horizontal, on which
loose or fragmented solid materials will start to slide; it is a slightly
greater angle than the angle of rest.