a. A high-pressure nozzle, mounted in a swivel on a skid frame, used to
direct high-pressure water (hydraulic water) on unconsolidated gravels and
sands in alluvial mining to break down, wash, and transport them.
Syn: hydraulic monitor
b. A self-dumping car, holding from 5 to 8 tons of coal. It is filled by
emptying the mine car into it at the foot of the slope or top of the
incline. See also: gunboat
c. A gas sampler for continuous sampling of the atmosphere in a mine,
usually sounding an alarm when the gas threshold is exceeded.
d. An instrument that measures ambient conditions in an area.
e. In hydraulicking, a high-pressure nozzle mounted in a swivel on a skid
frame. Nichols, 2
Dictionary of Mining, Mineral, and Related Terms