a. Loading so that cartridges or groups of cartridges are separated by
open spacers that do not prevent the concussion from one charge from
reaching the next. Nichols, 1
b. See:deck loading
A three-dimensional frame that is stable against wind pressure without
being braced against any other structure. Hammond
In crystallography, any one of 230 independent combinations of the 14
essentially different kinds of three-dimensional periodicity (Bravais
lattices) with other symmetry operations (point groups, screws, glides).
CF:plane group; Bravais lattice; point group; screw; glide.
a. A three-dimensional regularly repeating set of points so arranged as to
determine sets of equally spaced parallel planes in various directions
forming polyhedral cells (as in a honeycomb). Specif., a set of such
points occupied by the atoms of a crystal.
b. The pattern formed by the spatial distribution of atoms or radicals in
a crystal. See also:crystal pattern; lattice. Hackh
c. Any one of 14 infinite three-dimensional arrays of points such that
each point is in an identical point environment. Syn:Bravais lattice
CF:net
a. A piece of metal wire twisted at each end so as to form at one end a
guard to keep the explosive in a shothole in place and at the other end
another guard to hold the tamping in its place, thus providing an open
space between explosive and tamping. When this is provided, the charge
constitutes a cushion shot. Zern
b. Piece of wood doweling which is interposed between charges to extend
the column of explosive. Nelson
c. A marker block. Also called spacer block. Long
d. The tapered section of a pug joining the barrel to the die; in this
section beyond the shaft carrying the screw or blades, the clay is
compounded before it issues through the die. Dodd
The distance between adjacent shotholes in a direction parallel to the
quarry or other face. Nelson
See:coal constituent classification
a. A means of marking an underground survey station that consists of a
flat spike in which is drilled a hole for the threading of a plumbline.
BS, 7
b. See:spud
See:flat drill
A type of deflecting wedge in boreholes. See also:deflecting wedge
Long
Corn. A worker in the tin mines. Also called spalliard.
Standard, 2
A term used in South Wales for a train of personnel carriages, for use on
the main slants at the beginning and end of each shift. The seats are so
arranged that they are horizontal when the carriage is on the inclined
slant. See also:man-riding car; man-riding conductor. Nelson
a. A relatively thin, commonly curved and sharp-edged piece of rock
produced by exfoliation.
b. To break off in layers parallel to a surface.
c. To break ore. Pieces of ore thus broken are called spalls. Also
spelled: spawl.
Eng. A pickman; a working miner. A laborer in tinworks. Also spelled
spallier.
The chipping, fracturing, or fragmentation, and the upward and outward
heaving, of rock caused by the action of a shock wave at a free surface or
by release of pressure. Syn:exfoliation
A place for breaking ore with a 4- to 5-lb (1.8- to 2.3-kg) sledge hammer.
a. The horizontal distance between the side supports or solid abutments
along sides of a roadway. See also:abutment; pressure arch.
Nelson
b. The horizontal distance between the supports of a bridge, arch, beam,
or similar structural member. See also:clear span; effective span.
Hammond
Aust. Smooth, flat scales of gold.
A trigonal mineral, Cu6 Al(SO4 )(OH)12 Cl.3H2
O ; soft; vitreous; dark green; in Cochise County, AZ.
A variety of steatite in Aragon, Spain.
Emerald of the finest quality (presumably from South America).
Schaller