A term used to include electric blasting caps, ordinary blasting caps,
fuse, blasting machines, galvanometers, rheostats, etc., in fact,
everything used in blasting, except explosives. CF:blowing tools
Fay
A switch used to connect a power source to a blasting circuit. It is
sometimes used to short-circuit the leading wires as a safeguard against
premature blasts.
An instrument that utilizes a powerline as a source of electrical current
and that closes the circuits of successive blasting caps with a delay time
interval. The timer provides for the circuits of 15 charges and affords
positive control of the duration of intervals. Streefkerk
A tube of explosives, as nitroglycerin, for blasting. Standard, 2
A portable device including a battery or a hand-operated generator
designed to supply electric energy for firing explosive charges in mines,
quarries, and tunnels. Syn:blaster; exploder; shot-firing unit.
See also:single-shot blasting unit; multiple-shot blasting unit.
The energy from a blast that manifests itself in earthborne vibrations
that are transmitted through the Earth away from the immediate blast site.
Syn:ground vibrations
A fixed- or variable-sized outlet of a blast pipe. Fay
A relict texture in a metamorphic rock in which remnants of the original
granitic texture remain. AGI
Said of a relict texture in a metamorphic rock in which traces of an
original ophitic texture remain. AGI
Said of a relict texture in a metamorphic rock in which traces of an
original porphyritic texture remain. AGI
The array of drilled holes on the surface or underground to be loaded and
detonated in sequence; a pattern is indicated by the distance between
holes in a row (spacing) and between rows (burden).
Roasting conducted in a Dwight-Lloyd machine, in which roasting is
accompanied by sintering. The charge is placed in small boxes and ignited;
air is then drawn through to burn off sulfur.
Syn:Carmichel-Bradford process
The area where explosive material is handled during the loading and
detonation of blast holes; in surface blasting, it includes 50 ft (15.2 m)
in all directions from perimeter holes; underground, it includes 15 ft
(4.6 m) of solid rib. Atlas
A clay or earth that, either in its natural state or after chemical
activation, has the capacity for adsorbing or removing coloring matter or
grease from liquids (esp. oils). Syn:bleaching earth
See:bleaching clay
A small, usually rounded inclusion of one mineral in another; e.g., blebs
of olivine poikilitically enclosed in pyroxene.
In steelmaking, an ingot that has lost its molten center while cooling.
Standard, 2
a. A connection located at a low place in an air line or gas line, or
container, so that by means of a small valve the condensed water or other
liquid can be drained or bled off from the line or container without
discharging the air or gas. Long
b. A fine-adjustment valve (needle valve) connected to the bottom end of a
hydraulic feed cylinder in the swivel head of a diamond drill. By means of
the bleeder, the speed at which the hydraulic piston travels can be
minutely controlled. Long
c. A pipe on top of an iron blast furnace through which gas escapes.
Widely used for draining methane in coal mines in the United States where
the room-and-pillar method is employed. They are panel entries driven on a
perimeter of a block of coal being mined and maintained as exhaust airways
to remove methane promptly from the working faces to prevent buildup of
high concentrations either at the face or in the main intake airways. They
are maintained, after mining is completed, in preference to sealing the
completed workings. Hartman, 1
A pipe inserted in a seal to relieve gas pressure from a sealed area.