See:idrialite
A seal made from polyvinyl chloride reinforced with glass fiber. It is
inflated by compressed air and can cover or seal roadways up to 12 ft wide
and 10« ft in height (about 4 m wide and 3 m in height). It is used to
isolate a fire, or heating, and reduce the volume of smoke and gases so
that erection of stoppings can proceed in respirable air without workers
being hampered by breathing apparatus. Nelson
See:tumescence
An influence line usually pertains to a particular section of a beam, and
is a curve so drawn that its ordinate at any point represents the value of
the reaction, vertical shear, bending moment, or deflection produced at
the particular section by a unit load applied at the point where the
ordinate is measured. An influence line may be used to show the effect of
load position on any quantity dependent thereon, such as the stress in a
given truss member, the deflection of a truss, the twisting moment in a
shaft, etc. Roark
a. Eng. When pumps are working after the water has receded below some of
the holes of the windbore, they are said to be in fork.
b. Of mine pumps, sucking air and water. Pryor, 3
Pertaining to or designating that part of the electromagnetic spectrum
ranging in wavelength from 0.7 mu m to about 1 mm. CF:visible light
AGI
An instrument used for routine gas analysis for the determination of
methane and other gases. The results are accurate to 0.1%.
Sinclair, 1
This technique is employed in air survey during misty weather, using
special film that is more sensitive to infrared rays than to light rays.
See also:photogrammetry
An apparatus for sizing air elutriation of very fine particles.
See also:air classification
a. Structure produced at a deep crustal level, in a plutonic environment,
under conditions of elevated temperature and pressure, which is
characterized by plastic folding, and the emplacement of granite and other
migmatitic and magmatic rocks. This environment occurs in the internal
parts of most orogenic belts, but the term is used esp. where the
infrastructure contrasts with an overlying, less disturbed layer, or
superstructure. AGI
b. The basic facilities, equipment, roads, and installations needed for
the functioning of a system. AGI
Said of a mineral crystal or fragment that will not melt in the hottest
flame produced by a hand-held blowpipe or blowtorch, i.e., around 1,500
degrees C. The bronzite variety of pyroxene, e.g., has a melt point of
approx. 1,400 degrees C and is said to be practically infusible; quartz,
with a melt point of about 1,710 degrees C, is infusible.
A technique of shot firing in which an explosive charge is fired in a
shothole, which is filled with water under pressure and in which the
strata around the shothole have been infused with water. BS, 12
An obsolete syn. of diatomite. Syn:infusorial silica
See:infusorial earth
The point of entrance from a shaft to a level in a coal mine.
See also:inset
a. A mass of cast metal as it comes from a mold or crucible; specif., a
bar of gold or silver for assaying, coining, or export. CF:pig
Standard, 2
b. A mold in which an ingot may be cast. Standard, 2
c. A casting suitable for working or remelting. ASM, 1
In ore dressing, smelting, and refining, one who pours molten aluminum,
copper, or other nonferrous metals into solidifying ingots to compensate
for shrinkage that occurs when ingots cool in their molds. Also called
billet header; casting header; header; ingot pipe filler; pipe-out man.
DOT
Iron of comparatively high purity, produced, in the same way as steel, in
the open-hearth furnace, but under conditions that keep down the carbon,
manganese, and silicon content. See also:iron
CTD
A defect common to almost all metal ingots in which metal crystals
(dendrites) tend to grow at right angles to the walls of the mold and form
planes of weakness at their junctions; these make the ingot tender and it
tends to tear apart when rolled. Newton, 1
The mold or container in which molten metal is cast and allowed to
solidify in order to form an ingot. CTD