a. To cut or bore into old workings or water-bearing strata for the
purpose of proving or extracting gas or water. BS, 10
b. To intersect with a borehole and withdraw or drain the contained liquid
as water from a water-bearing formation or from underground workings.
Long
c. To drive one passageway into another. Hudson
d. To win coal in a new district. Fay
e. A threaded cone-shaped fishing tool. It may be either an inside or an
outside tap, depending on whether the tap fits into or over the outside of
a piece being fished. Syn:tapered tap
f. A quantity of a liquid, as molten metal from a furnace, run out at one
time. Webster 3rd
g. To drain a furnace. ASTM
h. To remove excess slag from the floor of a pot furnace. ASTM
A pointed bar by which a blast-furnace tap-hole is opened or the metal in
a melting pot, etc., is tested. Syn:tapping bar
A continuous ribbon or strip of steel, invar, dimensionally stable alloys,
specially made cloth, or other suitable material, having a constant cross
section and marked with linear graduations, used by surveyors in place of
a chain for the measurement of lengths or distances. AGI
These are applied as a routine matter to slope, temperature, sag,
standardization, gravity and sea level effect when measuring a length
accurately with a tape. See also:precision; tension correction.
Hammond
A gradual and uniform decrease in size, as a tapered socket, a tapered
shaft, a tapered shank. Crispin
A long cone-shaped noncoring bit used in drilling blastholes and in
wedging and reaming operations. When the nose of the bit is rounded and
the overall shape resembles the silk end of a corncob, the bit often is
called a corncob bit. CF:bullnose bit
A core bit having a conical diamond-inset crown surface tapering from a
borehole size at the bit face to the next larger borehole size at its
upper, shank, or reaming-shell end, as from EX to AX, or BX to NX.
Long
An end of rope having a reduced diameter to facilitate threading the rope
through fittings and over pulleys. Hammond
The common form of rolled steel joist in which the inner surfaces of the
flanges are tapered, normally at an angle of 98 degrees to the web.
See also:web
A reamer having a conical diamond-inset surface tapering from any borehole
size at its lower (bit) end to the next larger borehole size at its upper
(core barrel) end, such as EX to AX, AX to BX, BX to NX. Long
A tapered core bit having the cutting face set in the same manner as a
step-face bit. Long
See:tap
A sprocket with a split tapered bushing for rigid mounting on a shaft.
Jackson, 1
Measurement in inches of taper or slope for a 1-ft (0.3-m) length of the
threaded section of rod or pipe. Brantly, 2
A straight-sided pin that is smaller at one end than at the other.
Nichols, 1
A rope that has a gradually diminishing diameter from the upper to the
lower end. The diameter of the rope is decreased by dropping one wire at a
time at regular intervals. Both round and flat ropes may be made tapered,
and such ropes are intended for deep shaft hoisting with a view to
proportioning the diameter of the rope to the load to be sustained at
different depths. Zern
A device by which straight-type wedge can be attached to a diamond-drill
rod, lowered, and set in a borehole. Long
A method of measuring mine roadway area in which a tape is stretched
diagonally across the roadway. Offsets to the roof, floor, and sides are
taken at right angles to the tape and on both sides of it. Alternatively,
the floor of the cross section is divided into equal increments and
vertical offsets to the roof are made at each division. Horizontal offsets
to the sidewalls are made from the nearest adjacent vertical offsets. The
measurements so obtained are plotted to scale, and the area of the
resulting diagram is determined from the plot.
Syn:mine roadway area measurement
A hole at or near the bottom of a furnace or ladle through which molten
metal, matte, or slag can be tapped or drawn from a furnace. Also called
tapping hole. Syn:metal notch
The mineral series ferrotapiolite-manganotapiolite.