An orthorhombic mineral, Mn3 (PO4 )B(OH)6 ; pale- to
wine-yellow; in the Chicagoan Mine, near Iron River, MI.
A line drawn on a plan joining points on the floor or roof of a seam that
have the same height above a prescribed datum. BS, 7
An elevation of the sea floor, 1000 m or higher, either flat-topped
(called a guyot) or peaked (called a seapeak). Seamounts may be either
discrete, arranged in a linear or random grouping, or connected at their
bases and aligned along a ridge or rise. AGI
A shot that merely blows out a soft stratum in the coal or escapes through
a seam without loosening the main mass of coal. In Arkansas, called
squeal-out. Fay
Full of seams, so as to be difficult to blast.
a. Sensitive device, using the mine-detector principle, for locating
ferromagnetic material that is to be removed before ore treatment. It
typically monitors a stream of ore passing along a conveyor belt, which it
stops when iron is detected. Pryor, 3
b. Coil that is used in electromagnetic methods for measuring the magnetic
field that is associated with the electric current. Schieferdecker
Any area searched during interpolation between sample data points. Applies
to any interpolation method where a limited number of sample data points
are used to estimate intermediate values.
A monoclinic mineral, NaBSi2 O5 (OH)2 ; forms minute
spherulites composed of radiating fibers; at Searles Lake, CA.
A source of trona, Na3 (CO3 )(HCO3 ).2H2 O .
Occurs in Searles Lake, San Bernardino County, CA.
CCD, 2; Handbook of Chemistry and Physics, 2
Sand containing alkaline salts that attract and retain moisture and cause
efflorescence in brick masonry. Zern
An area of sea surface, variable in size and markedly different in
appearance, with color and/or oiliness; usually caused by plankton blooms.
Hy
Applied to quarrystone after the moisture has dried out.
A mode of treatment of iron castings that are allowed to remain in
storage, or to stand out in the open, for a more or less extended period,
e.g., 6 months, to effect a reduction in the residual stresses and
consequently in the degree of distortion during subsequent machining. A
very similar result can often be obtained by a comparatively short period,
e.g., 30 min, of tumbling. Since stress relieving by heat treatment is a
more certain process, and seasoning involves much delay and the use of
considerable space for storage, stress relieving is more usually employed.
Osborne
The drying of the sap and moisture in the woody fibers and thus reducing
the timber by shrinkage. It becomes more durable and weighs less. Timber
may be air-dried, i.e., dried naturally in air, or kiln-dried, which means
dried in kilns under the action of artificial heat. The former is more
general. See also:timber preservation
Numerical or written description of ocean surface roughness. Hy
a. The underclay or fireclay on which a coal seam rests. Also called
seating. Arkell
b. The foundation or framework on which a structure rests; e.g., engine
seat, cage seat. Fay
See:underclay
a. A British term for a bed of rock underlying a coal seam, representing
an old soil that supported the vegetation from which the coal was formed;
specif. underclay. A highly siliceous seat earth is known locally as
ganister. Also spelled: seatearth. Syn:seat rock; seat stone;
hard seat. AGI
b. A bed representing oil soil, usually containing abundant rootlets,
underlying a coal seam. BS, 11
c. The soil on which the coal forests fluorished. Nelson
d. Stratum underlying the valuable seam. Floor of a coal seam.
See also:underlying; underclay. Pryor, 3
a. Placed in position. Long
b. Closed by pressing the closure part of a valve against its seat.
Long
The surface of the point of support for a heavy load. Hammond
The deposit of soil under a loaded foundation within which the major
settlement occurs. See also:excavation deformation; settlement.
Nelson