The upper free-water surface of the zone of seepage. Syn:seepage line;
phreatic line. ASCE
The sighting or pointing line of a telescope, defined by the optical
center of the objective and the intersection of crosshairs.
See also:line of collimation
Locus of the points through which the resultant forces in an arch or
retaining wall pass. Hammond
The width marked by the exterior lines or sides of a tunnel.
An apparatus inserted in a line conducting air or steam to an air- or
steam-actuated machine that feeds small controllable amounts of
lubricating oil into the air or steam. Also called lubricator; potato.
Syn:air-line lubricator; line lubricator; oil pot; oiler; pineapple;
pot. See also:atomizer
a. A foot piece for uprights in timber sets. Nelson
b. Timber supports erected to reinforce existing sets that are beginning
to collapse due to heavy strata pressure. Nelson
c. A string of casing in a borehole. Long
d. See:lining
Plumblines, not less than two in number, hung from hooks driven in wooden
plugs. A line drawn through the center of the two strings or wires, as the
case may be, represents the bearing or course to be driven on. Fay
An assistant to a surveyor. BS, 7
The number of lines strung through the traveling block and crown block.
Brantly, 2
Timbers placed along the sides of the track of a working place in rows on
some predetermined plan. Kentucky
a. A command signifying that the drill runner wants the hoisting cable
attached to the drill stem, threaded through the sheave wheel, or wound on
the hoist drum. Long
b. To reposition a drill so that the drill stem is centered over and
parallel to a newly collared drill hole. Long
c. Regular linear pattern of peaks or troughs on a seismogram, such as
occurs when a reflection comes in. Schieferdecker
An iron ingot mold. Standard, 2
a. A casing of brick, concrete, cast iron, or steel, placed in a tunnel or
shaft to provide support. See also:tunnel lining
b. In grinding of rocks and ores, a layer of wear-resistant material, used
to protect rock breakers, shells of ball mills, chutes, launders, and
other areas subject to abrasion. Special plastics, rubber, and
acid-resistant alloys are used in vats, piping, and autoclaves, and for
pump impellers exposed to abrasion and chemical attack.
See also:scour protection
c. A cover of clay, concrete, synthetic film, or other material, placed
over all or part of the perimeter of a conduit or reservoir, to resist
erosion, minimize seepage losses, withstand pressure, and improve flow.
AGI
d. Supporting the rock sides of a mine gallery is known as lining, and the
material used in so doing is called the lining. Spalding
e. The planks arranged against frame sets. Zern
f. Refractory brickwork of furnace used to protect hearth, bosh, roof, or
walls. Pryor, 3
g. The brick, concrete, cast iron, or steel casing placed around a tunnel
or shaft as a support. Timber sets are not viewed as a lining.
See also:brick walling; guniting; liner; permanent shaft support.
Nelson
Eng. A drill hole in the mine roof with a wooden plug driven into it from
which to hang a plumbline. Fay
An instrument consisting essentially of a plate with a longitudinal slot
in the middle, and the means of suspending it vertically. It is used in
conjunction with a plumbline for directing the courses of underground
drifts, headings, etc. Webster 2nd
In surveying, placing the sights for driving entries, drifts, or rooms
nearer the working face. Fay
The operation of polishing as carried out on a linisher. This machine is
designed for the polishing of flat objects and carries a flat revolving
cloth belt whose surface is impregnated with a suitable abrasive material.
Osborne
A lightweight steel bar extending faceward from the steel supports behind
the conveyor. It supports the area between the conveyor and the coal on
longwall faces where cutter loaders are carried on armored flexible
conveyors. The joint and locking device may consist of a hinge pin and
wedge. The standard bar can carry in cantilever a maximum tip load of
about 2 st (1.8 t). In general, linked bars are stronger than corrugated
straps and wooden bars, and their use is increasing. Nelson
A chain conveyor. Nelson
An ore-deposit pattern in which adjacent, more or less parallel veins are
connected by diagonal veins or veinlets. AGI
In mineral processing, a stationary round table onto which finely divided
pulp (slimes) is fed from the center from a revolving feed box. A light
wash of water follows, and lighter particles are washed downslope to a
peripheral discharge launder. Behind this a heavier water flush displaces
the settled heavier material (concentrates) and flushes it down to a
bridging arrangement that delivers it to a separate discharge.
Pryor, 3