An instrument for measuring the vapor pressure and the relative humidity
of the air or the quantity of moisture in the air. It consists of a
dry-bulb thermometer and a wet-bulb thermometer, the latter having its
bulb covered with a layer of muslin kept moist with water. The rate of
evaporation from the moist muslin depends upon the quantity of moisture in
the air. The more rapid the evaporation, the greater the cooling, and
hence the greater the difference in the temperature readings of the two
thermometers. Also called: hygrometer. Standard, 2
a. Study of atmospheric humidity and its effect on workers. The
psychrometer, or hygrometer, measures the difference between dry-bulb and
wet-bulb thermometer readings. Pryor, 3
b. The determination of the psychrometric properties of air at a given
state point. Hartman, 2
c. Measurement of the humidity of air. Nelson
A fine-grained pelagic deposit with more than 30% calcium carbonate of
organic origin, of which pteropods are an important constituent.
AGI
See:mordenite
Primary folding in migmatites (injection gneisses, etc.), caused by the
high-temperature and high-pressure processes to which the migmatites owe
their origin and composite character. CF:flow folding
Land owned, controlled, or heretofore disposed of by the U.S. Government.
It includes the land that was ceded to the Government by the original 13
States, together with certain subsequent additions acquired by cession,
treaty, and purchase. At its greatest extent, the public domain occupied
more than 1,820 million acres (737 million ha). See also:public land
AGI
Land owned by a government, esp. a national government; specif. the part
of the U.S. public domain to which title is still vested in the Federal
Government and that is subject to appropriation, sale, or disposal under
the general laws. AGI
There is a clear distinction between public lands and lands that have been
severed from the public domain and reserved from sale or other disposition
under general laws. Such reservation severs the land from the mass of the
public domain and appropriates it to a public use. Ricketts
public limited liability company
An association of individuals, at least seven in number, who together
subscribe the necessary means or capital--i.e., money, property, or other
credit--to engage in a joint undertaking. Truscott
Land belonging to the United States containing a deposit of mineral in
some form, metalliferous or nonmetalliferous, in quantity and quality
sufficient to justify expenditures in the effort to extract it and subject
to occupation and purchase under the mining laws. Ricketts
An orthorhombic mineral, BiVO4 ; trimorphous with clinobisvanite
and dreyerite; reddish brown; a source of vanadium.
A worker employed in a coal mine to cut the floor in cases of creep or
upheaval toward the roof. CTD
a. A siliceous rock cut into blocks for furnace linings.
b. See:conglomerate
a. Earthy material--such as a mixture of clay, sand, and gravel--placed
with water to form a compact mass to reduce percolation. Seelye, 1
b. To place such material. Seelye, 1
c. To compact loose soil by soaking it and allowing it to dry.
Nichols, 1
d. The molten portion of a weld. Webster 3rd
e. To work (metal) while molten. Webster 3rd
f. To subject (iron) to the process of puddling. Webster 3rd
Steel made in a puddling furnace, a type of reverberatory furnace in which
the flame plays down upon the metal. Camm
a. Worker who converts cast iron into wrought iron by puddling.
See also:puddling
b. A rabble used in puddling. Webster 3rd
c. A puddling furnace. Webster 3rd
d. A system of small pipes admitting compressed air to a tank of water and
zinc chloride, to effect a thorough solution for use as a timber
preservative. Webster 2nd
e. A machine for breaking up alluvial wash, consisting of a shallow tank
in which the arms rotate slowly. The coarse stones are forked out and the
pulp passed down sluice boxes along which the gold settles.
See also:tormentor
Any of the roughing rolls through which puddle balls are passed to be
converted into bars. Collectively called a puddle train.
Standard, 2; Fay
The agitation of a bath of molten pig iron by hand or by mechanical means,
in an oxidizing atmosphere, in order to oxidize most of the carbon,
silicon, and manganese, and thus produce wrought iron.
See also:danks' puddler
A reverberatory furnace for puddling pig iron. Standard, 2
A machine used for mixing auriferous clays with water to the proper
consistency for the separation of the ore. Fay