A driving connection in two or more wheels or shafts that will turn them
at approx. the same relative speeds under any conditions.
Nichols, 1
A large structural feature or area that has had a long history of
progressive uplift; also, in a relative sense, one that has been stable or
has subsided much less than neighboring negative elements. AGI
Tabular, lathlike, or needle crystals with the electric vector of their
slow ray parallel to the long direction of the crystal.
Syn:length slow
a. Ore exposed on four sides in blocks of a size variously prescribed.
Syn:ore developed
Fay
b. Ore which is exposed and properly sampled on four sides, in blocks of
reasonable size, having in view the nature of the deposit as regards
uniformity of value per ton and of the third dimension, or thickness.
Fay
The orientation of a cutting tool in a manner, so that the angle formed by
the leading face of the tool and the surface behind its cutting edge does
not exceed 90 degrees ; e.g., teeth in a ripsaw. Syn:gouge rake
See also:gouge angle CF:rake
Stream of positively charged atoms or molecules that take part in the
electrical discharge in a rarefied gas. Positive rays have been studied by
allowing them to pass through a perforated cathode onto a photographic
plate, being deflected by magnetic and electrostatic fields (Thomson's
parabola method) and by means of Aston's mass spectrograph.
Syn:canal ray
positive temperature coefficient
Positive electron of the same mass as a negative electron; has only
transitory existence. Pryor, 3
The actual possession of a mining claim by the first arrival.
Title vested in the locator of a mining claim by compliance with the State
and Federal mining laws.
Any crystal face permitted by the symmetry of crystal structure but not
appearing on a particular mineral specimen.
An obsolete term for inferred reserves. See also:reserve
Syn:future ore
a. To bring the survey, maps, and records of a mine up to date.
Fay
b. A charge of ore for a smelting furnace. Webster 3rd
c. Any of the distance pieces to keep apart the frames or sets in a shaft;
a studdle. Webster 3rd
d. A mine timber, or any upright timber, but more commonly used to refer
to the uprights which support the roof crosspieces. Commonly used in metal
mines instead of leg which is the coal miners' term, esp. the in the
Western United States. Syn:upright
e. A support fastened between the roof and the floor of a coal seam; used
with certain types of mining machines or augers.
f. A pillar of coal or ore.
g. An item of kiln furniture. Posts, also known as props or uprights,
support the horizontal bats on which ware is sent on a tunnel kiln car.
Dodd
h. A discrete portion of bond between abrasive grains in a grinding wheel
or other abrasive article. When an abrasive grain held by a post has
become worn, the post should break to release the worn grain so that a
fresh abrasive grain will become exposed. Dodd
i. A mass of slate traversed by so many joints as to be useless for
building purposes.
j. Any of the four vertical timbers of a square set. Lewis
A mode of working coal, in which a certain amount of coal is left as
pillars and the remainder is taken away, forming rooms or other openings.
The method is also called bord-and-pillar; pillar-and-breast; etc.
Fay
A type of brake sometimes fitted on a steam winder or haulage. It consists
of two upright posts mounted on either side of the drum and operating on
brake paths bolted to the drum cheeks. See also:winder brake
Nelson
An auger (or drill) supported by a post. Fay
A shallow borehole. Long
A hand-rotated drilling tool that enables bores to be sunk down to about
20 ft (6 m) in unsupported holes and deeper in cased holes.
See also:shell-and-auger boring
Large auger, rotated mechanically or by hand, used for digging in
unconsolidated ground and retrieving a sample. Pryor, 3
In tectonics, said of a recurrence of forces and movement along lines or
over areas affected by similar forces in a previous period; overprint.
York. Extracting the post or pillars; pillar robbing.