The Upper Productive Coal Measures of the Pennsylvanian, of which they
constitute the highest member. CTD
This pump consists essentially of a rubber stator in the form of a double
internal helix and a single helical rotor which rolls in the stator with a
slightly eccentric motion. The rotor maintains a constant seal across the
stator and this seal travels continuously through the pump, giving a
positive uniform displacement. The Mono pump is manufactured to meet
mining conditions. The rotor is made of special abrasion-resisting or
noncorroding steel. The length of the stator and rotor provides for a
twist of slightly more than 360 degrees to provide for a complete seal.
For greater heads the length of stator and rotor are increased so as to
provide two or more complete seals in series and the head is then
developed in stages. Syn:progressing cavity pump
See:clinopyroxene
A relatively new underground transport system in which the carriages, or
buckets, are suspended from, and run along, a single continuous overhead
rail or taut wire rope. The monorail is used in coal mines to transport
supplies to the workings. It may be installed alongside the gate conveyor
and worked by endless or main rope. See also:overhead monorail;
overhead-rope monorail; Becorit system. Nelson
A traveling crane suspended from a single rail. Crispin
Said of a body of rock or a mineral deposit, the fabric of which is
identical throughout.
A tower crane that rotates through a full circle and is erected on a fixed
base. Hammond
An indentation hardness testing machine by which measurements are obtained
by the pressure required to indent a specimen with a diamond 5/8 mm in
diameter, the depth of indentation remaining constant. Henderson
A method of determining the indentation hardness of metals by measuring
the load required to force a spherical penetrator into the metal to a
specified depth. ASM, 1
a. Having a valence of 1. Webster 3rd
b. Having one valence; e.g., calcium, which has only one valence of 2.
Webster 2nd
a. Sp. Mountain.
b. Mex. Ores scattered through country rock and not found in deposits of
any appreciable size.
Moss agate from Montana.
Red garnet, pyrope or almandine.
Electric or steel-blue sapphire from Montana.
A possibly monoclinic mineral, Be2 TeO6 .2H2 O ;
yellow to white; forms earthy encrustations.
A solid bitumen that may be extracted by solvents from certain lignites or
brown coals. It is white to brown and melts at 77 to 93 degrees C.
AGI
A variety of amosite; an asbestiform variety of amphibole.
Rose quartz from Mont Blanc, southeastern France.
A triclinic mineral, (Au,Sb)2 Te3 ; forms tin-white crystals
at Montbray, Quebec. Named for the locality.
A triclinic mineral, LiAl(PO4 )(OH1 F) ; amblygonite group;
perfect cleavage; occurs in granite pegmatites where it may be a source of
lithium.
A plunger-type jig with the plunger beneath the screen. The distinguishing
feature of this jig is the use of two sets of valves beneath the screen
plate. Used in washing bituminous coal, both closely sized and slack
sizes. Mitchell