An instrument to determine the mechanical resonant frequency of a whole
crystal or cut crystal plate. A slowly varying frequency is applied to the
crystal from a signal generator, and the resonant frequency voltage
developed across the crystal is measured with a voltmeter. Also called
drive oscillator.
a. A pump consisting of a plunger or ram, the up-stroke of which causes
the suction valve to open and the water to rise in the suction pipe. On
the down-stroke of the plunger, the suction valve closes and the contained
water is forced through the delivery valve into the rising main or
discharge pipe. Nelson
b. A pump that forces water above its valves. Zern
c. A pump in which the water is lifted by the force due to atmospheric
pressure acting against a vacuum. Crispin
a. A small hand pump used in Cornish mining. Standard, 2
b. The solid piston of a force pump. Standard, 2
An orange-yellow opal colored with orpiment. Standard, 2
A fan which blows or forces the intake air into the mine workings, as
opposed to an exhaust fan. A mine exhaust fan may become a forcing fan
(with reduced efficiency) when the ventilation is reversed in an
emergency. Nelson
Scot. A set of pumps raising water by a plunger; a ram pump. Also called
forcing set. Fay
A pump for forcing water to a higher level or to the surface. CTD
a. A reservoir or pond at the head of a penstock or pipeline.
Seelye, 1
b. The water immediately upstream of any structure. Seelye, 1
An auxiliary combination for gas-fired boilers that provides an
incandescent surface for lighting gas instantly when turned on after being
shut off for any reason. Also called Dutch oven; doghouse. Fay
The one of a pair of parallel headings that is kept a short distance in
advance of the other. CTD
a. A projecting bay in the front of a blast furnace hearth under the tymp.
In open-front furnaces, it is from the forehearth that cinder is tapped.
Fay
b. An independent settling reservoir into which is discarded the molten
material from a furnace and which is heated from an independent source.
The heavy metal settles to the bottom and the light slag rises to the
surface. Fay
c. A section of a furnace, in one of several forms, from which glass is
taken for forming. ASTM
Coal received at a preparation plant from a source other than that to
which the plant is attached. BS, 5
Dark, ovoid inclusion of country rock in granite. Syn:furrener
Arkell
A fragment of country rock enclosed in an igneous rock. Syn:xenolith
A stable area marginal to an orogenic belt, toward which the rocks of the
belt were thrust or overfolded. Generally the foreland is a continental
part of the crust, and is the edge of the craton or platform area.
AGI
The steeper of the two limbs of an asymmetrical anticlinal fold.
AGI
A thrust fault cutting strata on the steeply dipping flank of an
asymmetrical anticline.
See:troctolite
The basic scale for measuring seawater color. See also:water color
Hy
The head person; esp., the overseer of a group of workers.
See also:mine foreman; boss. Standard, 2