A variety of hornblende. Standard, 2
a. A sheetlike, allochthonous rock unit, which has moved on a
predominantly horizontal surface. The mechanism may be thrust faulting,
recumbent folding, or both. The term was first used for the large
allochthonous sheets of the western Alps, and it has been adopted into
English. The German equivalent, decke, is also sometimes used in English.
Etymol: French, cover sheet, tablecloth. Syn:decke
AGI
b. Belg. See:aquifer
Liquid petroleumlike product found in cavities of igneous rocks and
assumed to be a product of thermal distillation of bituminous substances
contained in the country rocks. Tomkeieff
a. A roadway driven in the solid coal with rib sides. All roadways when
opening out a pillar method of working are narrow.
See also:working the whole
b. N. of Eng. A gallery, or roadway, driven at right angles to a drift,
and not quite so large in area. Fay
A railway gage narrower than the standard gage of 4 ft 8-1/2 in (1.44 m).
Hammond
Aust. Working place that is less than 6 yd (5.5 m) wide; these are paid
for by the yard in length. Fay
A stall driven in solid coal, usually from 6 to 9 ft (1.8 to 2.7 m) wide;
it has rib sides in coal. See also:rib-side; solid road. Nelson
a. The driving of narrow stalls to form coal pillars as the first stage in
the pillar-and-stall method of working. Nelson
b. A system of mining in which narrow coal roadways, called endings, are
driven along the strike of the seam, from 12 to 15 yd (11.0 to 13.7 m)
apart, to a limit line. The long narrow coal pillars between the endings
are extracted on the retreat. It has been adopted in parts of Yorkshire
and Lancashire, England. See also:endings; main endings. Nelson
c. All work for which a price per yard of length driven is paid, and
which, therefore, must be measured. Any dead work. Fay
d. Penn. Headings, chutes, crosscuts, gangways, etc., or the workings
previous to the removal of the pillars. Fay
e. A working place in coal only a few yards in width. Fay
See:bord-and-pillar method; narrow work.
Just formed by a chemical reaction, and therefore very reactive. Nascent
gases are probably in an atomic state. CTD
A steam hammer, having the head attached to the piston rod, and operated
by the direct force of the steam. Fay
See:soda spar
The screw thread of common use, formerly known as the United States
Standard thread. Crispin
A set of rules to guide electricians when installing electrical
conductors, devices, and machinery. Crispin
Gr. Brit. A system of rectangular coordinates used by the Ordnance Survey
and based upon the Transverse Mercator Projection (which is also known as
the Gauss Conformal Projection). BS, 7
Gr. Brit. Coordinates, referred to the National Grid of the Ordnance
Survey, which are specified in meters and consist of two components, an
Easting and a Northing. BS, 7
The Coal Industry Nationalization Act, 1946, which brought all coal mines
in the United Kingdom under public ownership. It was passed through
Parliament in JuIy 1946 and put into operation on January 1, 1947.
Nelson
British government organization that, among other things, tests and
certifies calibration of scientific glassware, weights, and measures.
Abbrev. NPL. Pryor, 3
a. Occurring in nature, either pure or uncombined with other substances.
Usually applied to metals, such as native mercury, native copper. Also
used to describe any mineral occurring in nature in distinction from the
corresponding substance formed artificially.
b. Adj. Applied to earth materials occurring in elemental form; e.g.,
nugget gold, metallic copper. Syn:native element
a. Metallic copper, sometimes containing a little silver and bismuth, that
occurs as a metasomatic deposit filling cracks and forming the cement of
sandstone and conglomerate. Such deposits have been found in the Keweenaw
Peninsula, Lake Superior, MI, USA; Chile; Queensland, Australia; and
Zimbabwe. Native copper is also found in the upper workings of copper
mines.
b. A mineral in the form of particles and nuggets of very pure metallic
copper associated (but not alloyed) with small amounts of silver and
arsenic minerals. It is found in small amounts in many copper ores but
occurs in commerical quantities in only one place in the world, the Upper
Peninsula in Michigan. See also:copper
Element that occurs in nature uncombined, such as nugget gold, metallic
copper, etc. See also:native