Below weathering. Pertaining to the consolidated material-bedrock or
high-velocity weathered layer or zone. This velocity is distinctly greater
than that in the weathered zone. AGI
a. An old name for amber, esp. amber mined in former East Prussia (Poland)
or recovered from the Baltic Sea.
b. A light yellow, amber-colored variety of grossular garnet.
The shape of the bottom of a cutting edge or tooth that tends to pull it
into the ground as it is moved. Nichols, 1
Corn. A honeycombed or porous stone.
A suction pump. Standard, 2
a. Atmospheric pressure pushing against a partial vacuum.
Nichols, 1
b. The pull of a pump. Nichols, 1
c. Adhesion of a mass of mud to the underside of an object being lifted
out of it. Nichols, 1
An anemometer that measures wind velocity by the degree of exhaustion
caused by wind blowing through or across a tube. Standard, 2
See:sand pump
The strainer at the foot of the suction pipe of a pump or of a suction
hose. Standard, 2
See:backlash
A suction chamber is designed to provide a trough of low pressure between
the sealed area and the intake, so that air that would otherwise be drawn
into the sealed area, through fissures and pores surrounding the seal, is
drawn instead into the chamber. If the pressure within the sealed-off mine
area is less than that outside, it is necessary to reduce the pressure
within the chamber. This can be done by using an ejector or fan to draw
air through a pipe in the outer wall of the chamber; a second pipe, fitted
with a control valve, serves as an intake. Adjustment of the valve gives
regulation of the chamber pressure within fine limits. Roberts, 1
a. In dredging, use of pump fed by pipe with power-rotated cutting blades
to lift spoil. Pryor, 1
b. In alluvial dredging, use of power-rotated cutting shoe to detach
minerals from deposit, followed by their delivery by suction and elevation
through a centrifugal pump. Pryor, 3
A dredge in which rotary blades dislodge the material to be excavated,
which is then removed by suction, as in a sand-pump dredger. CTD
a. A dredge that digs by means of powerful suction pumps, the semiliquid
spoil thus raised being frequently conveyed away in a floating pipeline.
Hammond
b. See:sand-pump dredger
c. A dredge in which the material is lifted by pumping through a suction
pipe.
A fan that sucks or draws the air toward it through airways or air pipes.
The term generally used is exhaust fan. Nelson
The head or height to which water can be raised on the suction side of the
pump by atmospheric pressure. See also:lift pump
In pump nomenclature, it exists when the liquid level is below the pump
centerline and/or when a gage on the suction would show a vacuum.
An augite-bearing hypersthene basalt characterized by pillow structure and
containing bytownite and magnetite. It differs from normal basalts in
containing neither glass nor olivine and in having an equigranular texture
(Johannsen, 1937). Its name, given by Coleman in 1914, is derived from the
Sudbury District, ON, Canada. Not recommended usage. AGI
A variety of sandstone that breaks up into granules resembling sugar.
Corn. Friable granular quartz. See also:sugary quartz
a. Eng. An ironstone in Norfolk, so-named from its rich brown color.
Arkell
b. Compact white to pink datolite from the Michigan copper district.