a. A dredge with a digging mechanism consisting of a ladderlike truss on
the periphery of which is attached an endless chain that rides on sprocket
wheels and on which buckets are attached.
b. A mechanical dredge that uses a chain of heavy buckets rotating over
the dredging arm or ladder to excavate and lift material to the dredging
platform. Syn:bucket-line dredge; ladder-bucket dredge.
See also:dredger
A mechanical excavator working on the same principle as a bucket-ladder
dredge, but adapted for use on land. See also:trench excavator
CTD
The discharge pipe of a lifting pump in a mine. Standard, 2
An endless line of digging buckets on a dredger or on a bucket elevator.
Pryor, 3
a. A form of portable, self-feeding, inclined bucket elevator for loading
bulk materials into cars, trucks, or other conveyors.
See also:bucket elevator; portable conveyor.
b. A machine having a digging and gathering rotor and a set of
chain-mounted buckets to elevate the material to a dumping point.
Nichols, 1
a. An iron or wooden receptacle for hoisting ore, or for raising rock in
shaft sinking. Fay
b. A reciprocating lift pump formerly much used in shafts and sinkings.
Nelson
A pulley attached to a shovel bucket, through which the hoist or drag
cable is reeved. Nichols, 2
The surface temperature of the sea as measured by a bucket thermometer or
by immersing a surface thermometer in a freshly drawn bucket of water.
Hunt
A water-temperature thermometer provided with an insulated container
around the bulb. It is lowered into the sea on a line until it has had
time to reach the temperature of the surface water, then withdrawn and
read. The insulated water surrounding the bulb preserves the temperature
reading and is available as a salinity sample. Hunt
A device that tilts or turns the buckets of a pivoted bucket conveyor,
causing them to discharge. It may be fixed or movable.
An hydraulic cutter dredge that uses a bucket wheel excavator in place of
the traditional rotary cutter. The bucket wheel is characterized by its
high cutting torque in both directions and by a positive feed of the
excavated material into the mouth of the dredge pipe. Cruickshank
A continuous digging machine originally designed and used in large-scale
stripping and mining of brown coal deposits in eastern Germany. Its
digging mechanism is essentially a boom on which is mounted a rotating
vertical wheel having buckets on its periphery. As the rotating wheel is
pressed into the material to be dug, the buckets cut, gather, and
discharge the material onto a conveyor belt where it is moved to the mined
materials transport system.
A rectangular piece of cast iron 5 to 6 in (12.7 to 15.24 cm) across,
usually rounded fore and aft with an eye on the back and with a wooden
handle; used for grinding ore on a cast-iron bucking board. Hess
An iron plate on which ore is ground by hand by means of a bucking hammer.
Used extensively for the final reduction of ore samples for assaying.
See also:muller
a. A black variety of epidote containing iron and having nearly
symmetrical crystals.
b. A former name for allanite.
a. A bend in a piece of drill-stem equipment induced by excessive feed
pressure. Long
b. Deformation of component members of a drill derrick, tripod, or mast,
caused by attempting to hoist too heavy a load or by applying excessive
strain when pulling on stuck casing, etc. Long
The length of drill rod that will withstand flexure or bending when
subjected to a specific feed pressure or compressional load. Long
The maximum load that can be imposed on a string of drill rods, casing, or
pipe, or on a drill tripod, derrick, or mast without the string buckling;
also, a part being bent or buckled. Long
See:bull quartz