A tractor loader that digs in front and can swing the bucket to dump to
the side of the tractor. Nichols, 1
Arkansas. To gradually loosen over a considerable area and sag; said of
the rock over a mine working.
The largest diameter of work that can be carried between the centers of a
lathe. In England, the swing refers to radius. Crispin
Arkansas. A parting some distance from the mouth of an entry. The loaded
cars are left by the gathering driver to be taken out by a swing driver.
See:swing
In a revolving shovel, one of several tapered wheels that roll on a
circular turntable and support the upper works. Nichols, 1
a. Workday from 4 p.m. to midnight. Nichols, 1
b. Occasionally refers to the 12 midnight to 8 a.m. shift.
Nichols, 1
c. Working arrangement in a three-shift continuously run plant that
changes working hours at regular intervals. During swing the old morning
shift becomes the new afternoon shift. The afternoon shift of the first
period must work the morning shift of the next with only an 8-h break on
the first day of change. Pryor, 3
A fraudulent imitation of lapis lazuli (lazurite) obtained by staining
pale-colored jasper or ironstone with ferrocyanide. Also known as German
lapis. See also:false lapis
a. A mine switch is a device for enabling a car or a trip of cars to pass
from one track to another. The term switch is also frequently used in a
loose sense to apply to the whole side track or turnout, and a car
standing on a side track is frequently said to be standing on the switch.
See also latches. Kiser
b. Eng. A mechanical device for opening and closing an electric circuit; a
mechanism for shifting a moving body in another direction. CTD
a. A zigzag arrangement of a roadway (or rail tracks) for surmounting the
grade of a steep hill or the slope wall of a surface or open-pit mine.
Common in mountainous mining districts.
b. A hairpin curve. Nichols, 1
c. See:shunt back
This is a general term applied to switching, interrupting, controlling,
metering, protective, and regulating devices, as well as assemblies of
these devices with associated interconnections, accessories, and
supporting structures. The term is used primarily in connection with
generation, transmission, distribution, and conversion of electric power.
An iron plate on tramroads in mines used to change the direction of
movement. Syn:turnsheet
A movable tongue or rail for diverting a train from one track to another.
a. The arrangement of levers by means of which a switch is thrown for the
straight track or the turnout. Jones, 1
b. The handle or lever by which a switch is operated.
A colloquial term used in the Wisconsin lead-mining region for an offshoot
or branch of a main lode. AGI
a. A coupling where one link is made so that it can be rotated
independently of other links. When such a coupling is used, one or more
cars can be rotated on a revolving dump without uncoupling from the rest
of the trip. Zern
b. A coupling that gives complete rotary freedom to a deflecting
wedge-setting assembly in boreholes. Long
a. The assembly of a spindle, chuck, feed nut, and feed gears on a
diamond-drill machine that surrounds, rotates, and advances the drill rods
and drilling stem. On a hydraulic-feed drill, the feed gears are replaced
by a hydraulically actuated piston assembly. Also called boring head;
drill head; drilling head; gate. Long
b. In a diamond drill, the mechanism that rotates the kelly and drill
string. Nichols, 1
The bevel gear mounted on the outside of the drive quill in the swivel
head of hydraulic-feed and/or some types of gear-feed diamond drills. The
gear meshes with, and is driven by, a matching gear on the drill-motor
shaft. Long
See:hoisting plug
Syn. for a water or a mud swivel in borehole drilling. Also called
gooseneck. Long
See:hoisting plug