In a circular mine shaft, a steel ring made of segments wedged securely to
rock walls for use as a foundation for masonry lining. Also called:
wedging ring; wedging curb. Pryor, 3
See:curb
Breaking down coal at the face with hammers and wedges instead of by
blasting. Fay
A reaming bit used to ream down alongside and pass the deflection wedge
when deviating a borehole. Also called wedge bit; wedge reaming bit.
Long
An opening shot. A center cut. Fay
An orthorhombic mineral, K2 (UO2 )2 Si6 O (sub
15) .4H2 O ; resembles uranophane; in the Thomas range, Juab
County, UT. Syn:gastunite
An inclined water gage. Nelson
A small feeder of water. BS, 10
A porous rock from which water oozes.
Oxygen supply fed automatically to a rescue worker through a valve
controlled by the worker's breathing action, forming part of a portable
outfit. Pryor, 3
A triclinic mineral, Na5 (CO3 )(HCO3 )3 ;
forms fibrous aggregates of tiny acicular to bladed crystals; Green River
formation, WY.
a. A mixture of pilsenite and hessite.
b. A peridotite composed chiefly of olivine and clinopyroxene with
accessory opaque oxides common.
An orthorhombic mineral, Pb6 Bi8 (S,Se)18 (?) ;
differs from galenobismutite in possessing two distinct cleavages;
steel-gray.
See:dopplerite
Batching plant in which all ingredients for a concrete mix are measured by
weight. Hammond
Person who weighs zinc ore and other materials to be sintered, and crushes
sintered ore preparatory to further reduction. DOT
A device that handles the feed continuously over a belt that is balanced
to weigh a stream of ore. Pit and Quarry
An electronic system which weighs individually loaded coal wagons as they
roll over a rail scale, feeding the information into a totalizing printer,
which automatically prints out gross and net weights. It employs
hermetically sealed load cells which accurately convert physical weight
into electrical impulses. See also:weightometer
Syn:electronic weighing
A traveling hopper for receiving, weighing or measuring, and distributing
bulk materials. Usually fitted with a scale, either manually operated or
of the automatic recording type. Weigh larries may be suspended between
overhead tracks or carried on rails mounted below them. They may be
hand-pushed or power-propelled, and some designs provide a riding platform
or cab for the operator. A remote-control device for operating the bunker
or bin gates is usually mounted on the larry chassis.
a. Roof movement, esp. when it can be seen or heard. Mason
b. Fracturing and lowering of the roof strata at the face as a result of
mining operations. See also:crush
Weighing and combining the correct proportion of cement and aggregate in a
concrete mix. Nelson