A prop consisting of two telescoping steel cylinders that are extended by
hydraulic pressure that may be provided by a hand-operated pump built into
the prop. The prop holds about half a gallon of mineral oil and is fitted
with a yield valve that relieves the pressure when the load exceeds that
for which the prop is set. A hydraulic prop enables quicker setting and
uniform initial loading, and it can be withdrawn from a remote, safe
position. The hydraulic prop was first used in a British coal mine in
1947. See also:steel prop
The use of water to clear away superficial deposits and debris to expose
outcrops, for the purpose of exploring for mineral deposits.
Syn:hushing
In a stream, the ratio of the area of its cross section to its wetted
perimeter. Symbol: R. Syn:hydraulic mean depth
a. A pump that forces running water to a higher level by utilizing the
kinetic energy of flow, only a small portion of the water being so lifted
by the velocity head of a much larger portion when the latter is suddenly
checked by the closing of a valve. Also called ram. Webster 3rd
b. A device for lifting water by the water hammer produced by checking the
flow periodically. Seelye, 1
c. The plunger of a hydraulic press. CTD
d. A device whereby the pressure head produced when a moving column of
water is brought to rest is caused to deliver some of the water under
pressure. CTD
Method of drilling that uses rotating bits lubricated by a stream of mud.
Mersereau, 2
A branch of science that deals with practical applications, such as the
transmission of energy or the effects of flow of water or other liquid in
motion. Webster 3rd
The set obtained by the addition of water to hydraulic setting materials.
The process of moving materials by water; colloquially, hydraulicking.
Seelye, 1
The filling of the waste in mines by waterborne material by pipeline.
See also:pneumatic stowing
A steel or iron pipe used for transporting the material in hydraulic
stowing. Ordinary pipes wear very rapidly owing to the chippings in the
water; therefore, they are lined with abrasion-resistant material. This
lining gives a very much longer life to the pipe. Nelson
The excavation and removal of overburden by hydraulicking. Nelson
Movement of ore by water flowing through pipelines. Includes hydraulic
hoisting. See also:pipeline transport
An underreamer with cutting lugs that can be expanded or retracted by a
hydraulically actuated device. See also:underreamer
A valve for regulating the distribution of water in the cylinders of
hydraulic elevators, cranes, etc. Crispin
A commercial process for the production of hydrogen by reaction of caustic
soda on aluminum. Osborne
Denotes a very common microlithotype in Japanese Tertiary coal. It
consists of the macerals vitrinite, degradinite, and exinite. The dull
bands of many Japanese Tertiary humic coals consist largely of hydrite and
generally occurs alternating with vitrite as microfine bands, one or the
other predominating.
An instrument for determining the depth of sea water by its pressure.
Crispin
A monoclinic mineral, 1:1 interstratified biotite and vermiculite; in
clay.
Any organic compound, gaseous, liquid, or solid, consisting solely of
carbon and hydrogen. They are divided into groups of which those of
special interest to geologists are the paraffin, cycloparaffin, olefin,
and aromatic groups. Crude oil is essentially a complex mixture of
hydrocarbons. AGI
Very weak oil or gas seeps, so weak that the deposition of material at the
surface cannot be recognized without chemical analysis. Hawkes, 2
A basic carbonate of lead, Pb3 (CO3 )2 (OH)2 .
It occurs as a secondary mineral found associated with leadhillite,
matlockite, cerussite, mendipite, and paralaurionite. Dana, 2