A hygrometer in which the two thermometers are mounted side by side on a
brass frame and fitted with a loose handle so that it can be whirled in
the atmosphere to be tested. The instrument is whirled at some 200 rpm for about 1 min and the readings on the wet- and dry-bulb thermometers
recorded; used in conjunction with Glaisher's or Marvin's hygrometrical
tables. It gives more consistent and accurate results than the ordinary
instrument. See also:whirling hygrometer
a. A tetragonal mineral, FeGe(OH)6 ; greasy; at Tsumeb, Namibia.
b. The mineral group jeanbandyite, mopungite, stottite, and
tetrawickmanite.
a. A large steel furnace or oven connected with the blast furnace to
preheat the blast before it is introduced into the furnace proper.
Mersereau, 2
b. A kiln, as for firing pottery or drying minerals. Webster 2nd
a. In anthracite only; two sizes of stove coal are made, large and small.
Large stove, known as No. 3, passes through a 2-1/4- to 2-in (5.7- to
5-cm) mesh and over a 1-7/8- to 1-1/2-in (4.8- to 3.8-cm) mesh; small
stove, known as No. 4, passes through a 1-7/8- to 1-3/8-in (4.8- to
3.5-cm) mesh and over a 1-1/8- to 1-in (2.9- to 2.5-cm) mesh. Only one
size of stove coal is now usually made. It passes through a 2-in (5-cm)
square mesh and over a 1-3/8-in (3.5-cm) square mesh. Zern
b. See:anthracite coal sizes
Stoved open-pan salt. Kaufmann
Riveted-seam or spiral-welded-seam, thin-wall pipe used as a conductor,
standpipe, or casing in a borehole. Long
See:stovepipe
a. To pack away rubbish into goaves or old workings.
b. To gob; to fill the waste; to put debris into the waste. Mason
Scot. In longwall mining the space from which the mineral has been
extracted and which has been filled with waste.
Derb. A wooden landmark, placed to indicate possession of mining ground.
Also spelled stowse.
a. A method of mining in which all the material of the vein is removed and
the waste is packed into the space left by the working.
b. The debris of a vein thrown back of a miner and which supports the roof
or hanging wall of the excavation. Zern
c. See:solid packing
Any of several methods of working coal or ore deposits in which systematic
stowing of the worked out areas is part of the system.
See also:coal mining methods; solid stowing; strip packing.
Nelson
A vertical mine timber, esp. one supporting a set in a shaft.
See:split spread
From the German "strahlstein." (radiating stone), the original name for
actinolite (Greek "aktis" radiating). See also:actinolite
Common term for straight brick, as a 9-in (23-cm) straight.
In stripping, a pit that follows a straight line when projected on a
horizontal plane. Woodruff
See:chopping bit
In quarrying, a saw gang that slides back and forth on a bed, as
contrasted with the ordinary saw gang that swings back and forth when
suspended from above.
Dynamites composed of nitroglycerin, a combustible such as wood meal,
sodium nitrate, and an antacid, such as calcium or magnesium carbonate,
and are made in 15% to 60% strength, the percentage representing the
proportion of nitroglycerin in the dynamites. They are powerful, quick
acting, and fairly water resistant, but on detonation produce poisonous
gases, esp. in the higher grades. Their relatively high cost, sensitivity
to shock and friction, and high flammability, together with the dangerous
fumes developed, make them less suitable for general use than more
recently developed modifications. Lewis; Carson, 1
A system of leveling using a straightedge and a spirit level.
BS, 7