Copper vessels are lined or coated with tin by the application of molten
tin upon clean copper with the aid of fluxing. CCD, 2
Rock ore that breaks into large blocks. Sandstrom
A monoclinic mineral, Na2 Mg(SO4 )2 .4H2 O .
Also spelled bloedite, blodite. Formerly called astrakhanite.
Syn:astrakanite; magnesium blodite.
Bloman tube breathing apparatus
This differs from the smoke helmet in that there is neither helmet nor
bellows. Fresh air is passed to the wearer through a corrugated reinforced
rubber tube by means of a rotary blower. A mouthpiece having an inhalation
valve, an exhalation valve, and a noseclip takes the place of the helmet.
It is held in position by straps attached to a head harness. The
mouthpiece can be replaced by a full-face mask. This apparatus is fitted
with an equalizing device that enables the wearer to continue breathing
comfortably, even should the rotary blower stop. Mason
See:priorite
a. A variety of chalcedony or jasper, dark green in color, interspersed
with small red spots. Used as a gem. Also called heliotrope. CF:plasma
Sanford
b. A red variety of quartz.
A pipe or flexible tube conducting cuttings-laden air or gas from the
collar of a borehole to a point far enough removed from the drill rig to
keep the air around the drill dust free. Long
a. A mineral that is frequently found as an efflorescence, cobalt bloom,
for example. Syn:efflorescence
b. To form an efflorescence; as, salts with which alkali soils are
impregnated bloom out on the surface of the Earth in dry weather following
rain or irrigation. Webster 2nd
c. The fluorescence of petroleum or its products. Webster 3rd
d. A semifinished hot-rolled product, rectangular in cross section,
produced on a blooming mill. For iron and steel, the width is not more
than twice the thickness, and the cross-sectional area is usually not less
than 36 in2 (232 cm2 ). Iron and steel blooms are
sometimes made by forging. ASM, 1
e. A surface film resulting from attack by the atmosphere or from the
deposition of smoke or other vapors. ASTM
f. A lump or mass of molten glass. Webster 2nd
See:blooming mill
A forge for making wrought iron, usually direct from the ore.
Syn:cinder plate; Merrit plate. Fay
The mill or equipment used in reducing steel ingots to blooms.
ASM, 1
a. A sudden escape of gas from coal or associated strata into mine
workings. See also:outburst
b. A large outcrop of ore, commonly of low grade. Nelson
c. To lift: said of a floor that lifts owing to pressure from gas or
strata. Mason
d. In blasting, a shot that blows part of the unfired explosive out of the
hole. See also:blown-out shot
e. To fire shots. Mason
The number of blows that must be delivered by a specific-weight, freely
falling drive hammer dropping a specific distance to force a drive sampler
a unit distance into a soil material. Long
a. A fan employed in forcing air either into a mine or into one portion of
a mine. A portable blower, also known as a tubing blower or room blower,
is used in ventilating small dead-end places like rooms and entries or
gangways. Jones, 1
b. The sudden emission of combustible gases from the coal seam or
surrounding rock. Blowers vary considerably in violence and magnitude from
small emissions that make a hissing noise to severe outbursts.
Nelson
c. Eng. A worker who blasts or fires shots in a mine, or who drills the
holes and charges them, ready for firing. Fay
A fan to direct part of an air circuit through a tubing to a particular
working face. See also:mine ventilation auxiliary fan
A system in which the pressure-generating source is located at the
entrance and raises the pressure of the air above atmospheric.
Hartman, 2
A pale yellow, soft variety of ozocerite that is squeezed out of the veins
under the influence of pressure of the surrounding rocks.
Syn:blister wax
a. A minute crater formed on the surface of thick lava flows. Fay
b. A hole in a casting or a weld caused by gas entrapped during
solidification. See also:gas evolution
To put a blast furnace in operation. Syn:blowing in
a. Oxidation of molten metal or matte in a converter or other smelting
furnace, in order to remove carbon and sulfur and to convert impurities to
slag.
b. The bursting of pots from too rapid heating. ACSG, 2
An engine for forcing air into blast furnaces under pressure, commonly
about 1 psi (6.9 kPa). Weed, 2