An instrument used in surveying for measuring horizontal angles.
Syn:surveyor's dial
Webster 3rd
A simple instrument made of two bars forming a right-angled cross with
sights at each end and used in setting out right angles in surveying.
Webster 3rd
A leveling instrument consisting of a telescope (with cross hairs) and a
spirit level mounted on a tripod, revolving on a vertical axis, and having
leveling screws that are used to adjust the instrument to the horizontal.
AGI
A system of measurement used in land surveying, having the surveyor's
chain (one chain = 4 rods = 66 ft = 20.1 m = 100 links = 1/80 mile) as a
unit. CF:Gunter's chain
Well-surveying device for large-diameter holes that determines the
departure of the borehole from vertical. Uses a gyroscope and spherical
level with a photographic record made on 16-mm moving-picture film, which
includes a photograph of a small watch by which the depth is determined
from correlation with a synchronized depth-time record made at surface.
AGI
A trigonal mineral, Pb4 (SO4 )(CO3 )2 (OH)
2 ; trimorphous with leadhillite and macphersonite; in the Susanna
Mine, Leadhills, Scotland.
a. Property of a material that defines the extent to which it will be
magnetized in a given external field. Schieferdecker
b. The ratio of the electric polarization to the electric intensity in a
polarized dielectric. The ratio of induced magnetization to the strength H
of the magnetic field causing the magnetization.
Syn:magnetic susceptibility; volume susceptibility. AGI
A terrane whose spatial and genetic relations with respect to adjacent
terranes during their time of formation is unknown or uncertain. Inasmuch
as most terranes fall into these categories, the term may be considered
redundant. See also terrane. AGI
Particles from the feed, of specific gravity equal or close to that of a
separating medium, and which are therefore relatively difficult to remove
from the bath. BS, 5
Solids that can be separated from a liquid by filtration. Bennett
A vertical conveyor having one or more endless chains with suitable
pendant trays, cars, or carriers that receive objects at one elevation and
deliver them to another elevation. Syn:corner-fastened tray conveyor;
corner-hung tray conveyor; suspended tray elevator; suspended tray lift.
A permanent method of lining a circular shaft in which the tubbing (German
type) is temporarily suspended from the next wedging curb above. Slurry is
run in behind the tubbing by means of a funnel passing through the holes
provided in the segments. No temporary supports are required.
See also:tubbing
See:vadose water
a. The condition of a mixture of solid particles and water or air in which
the solid particles are individually supported, normally by means of an
upwardly moving current and sometimes with the assistance of mechanical
agitation. BS, 5
b. A mode of sediment transport in which the upward currents in eddies of
turbulent flow are capable of supporting the weight of sediment particles
and keeping them indefinitely held in the surrounding fluid (such as silt
in water or dust in air). AGI
c. The state of a substance in such a mode of transport; also, the
substance itself. AGI
d. A method of rock bolting employed to secure loose fragments or sections
of rock that may fall from a mine roof. Lewis; Fraenkel
See:flash coal dryer
Small solid particles suspended in a liquid; they exhibit the Brownian
movement and do not settle by themselves, but can be readily coagulated.
Bennett
Material in suspension that is to be filtered out. Bennett