A concave projection at the upper edge of a ladle to guide the metal in
pouring. Mersereau, 2
Worker who pours molten glass from a suspended ladle on casting table for
rolling into sheet glass. DOT
A set of tables and associated information for correcting reversing
thermometers and computing dynamic height anomalies; compiled by E.C.
Lafond and published by the U.S. Navy Hydrographic Office as H.O. Pub. No.
617. Hunt
a. To place planks, slabs, or small timbers over horizontal, or behind
upright, members of mine timber sets to form a ceiling or wall.
Long
b. In flotation, any retardation of an output with respect to the causal
input. Fuerstenau
c. A flattish piece of wood or other material to wedge the timber or steel
supports against the ground and to secure the area between the supports.
See also:lid; wedge. Nelson
d. To protect a shaft or level from falling rock by lining it with timber
(lagging). CTD
e. Time required for circulation liquid to travel downward from the drill
pump through the drill string to the bit or upward from the bottom of the
borehole to the collar. Long
f. The lapse of time between the occurrence of an event or condition and
its detection on a recording device. Long
g. To provide or cover with lags; as, to lag a boiler with a nonconductor;
to lag timbers in a mine. See also:lags; lagging.
Standard, 2; Fay
h. A distance class interval used for variogram computation.
See:lag gravel
Ger. The enclosed pieces of older rocks in a sedimentary ore deposit.
Schieferdecker
An overthrust, the thrusted rocks of which move differentially so that the
upper part of the geologic section is left behind; the replacement of the
upper limb of an overturned anticline by a fold fault.
Syn:tectonic gap
A metal plate with raised areas, to be inserted in the bottom of shaker
conveyor troughs and held in place by spot welding. The raised areas
assist coal travel on steep grades or under wet conditions.
Jones, 1
a. Lagging wedges and secures the roof and sides behind the main timber or
steel supports in a mine and provides early resistance to pressure. If
concrete slabs are used, they are made in lengths to fit between the arch
webs. The lagging behind steel arches in tunnels may be pyrolith-treated,
fire-resisting boards. Also called lacing. Nelson
b. Pieces of timber about 4 ft 6 in by 6 in by 2 in (1.4 m by 15 cm by 5
cm) with one end sharpened or beveled to give the lath an upward trend
when being driven into the roof gravels. A number of laths driven into the
roof form a protective shield for the miners working in the face.
Sometimes called laths. Eng. Min. J., 1
c. In shafts, planks, usually 2 in, placed on the outside of sets. Coeur
D'Alene lagging has 2-in by 2-in cleats nailed to the top and bottom of
the wall and end plates about 2 in back from the outer edge. The lagging
is then cut to fit between the plates and is placed against the cleats and
flush with the plates on the outside. Lewis
d. Narrow boards, generally planed, placed horizontally on the arch frames
of a center. On this lagging the arch of masonry is built. The term is
also applied to poling boards. Stauffer
e. Planks, slabs, or small timbers placed over the caps or behind the
posts of the timbering, not to carry the main weight, but to form a
ceiling or a wall, preventing fragments or rock from falling through.
See also:lag
f. Heavy planks or timbers used to support the roof of a mine, or for
floors of working places, and for the accumulation of rock and earth in a
stope. Fay
g. Long pieces of timbers closely fitted together and fastened to the drum
rings to form a surface for the rope to wind on. Fay
h. The narrow strips supporting an arch of masonry while in construction.
Standard, 2
i. The surface or contact area of a drum or flat pulley, esp. a detachable
surface or one of special composition. Nichols, 1
j. Boards fastened to the back of a shovel for blast protection.
Nichols, 1
k. Covering on boilers, tanks, and pipes used to provide thermal
insulation. Pryor, 3
l. Material applied to pulleys to increase traction between the pulley and
belt and to decrease wear on both. See also:backing deals
m. Verb. To install lagging. AGI
See:roof stringer
a. A residual accumulation of rock fragments remaining on a surface after
the finer material has been blown away by winds.
See also:desert pavement; pebble armor. AGI
b. Coarse-grained material that is rolled or dragged along the bottom of a
stream at a slower rate than the finer material, or that is left behind
after currents have winnowed or washed away the finer material. Syn:lag;
lag deposit. AGI
Fr. In sheet glass manufacture, a sheet of perfectly smooth glass,
interposed between the flattening stone and the cylinder that is to be
flattened. Standard, 2
Eng. Long pieces of timber closely fitted together and fastened to oak
curbs or rings forming part of a drum used in sinking through quicksand or
soft ground. CF:lag
a. A square-headed, heavy wood screw. It must be tightened down with a
wrench because its head is not slotted. Crispin
b. A flat-headed machine screw by which to fasten wood lagging, as on a
curve surface. Standard, 2
The total time between the initial application of current and the rupture
of the circuit within the detonator. BS, 12
See:mudflow
Black monoclinic mineral, Fe2+ Fe23+ (SiO4
)2 .
Clay; mud; mire. Arkell
A trigonal mineral, Bi4 (Se,S)3 . Syn:selenjoseite
In Alaska, a placer in the bed of a present or ancient lake; generally
formed by landslides or glacial damming.
Copper produced from the Lake Superior ores in which the metal occurs
native and is of high purity. CTD