A manganoan variety of fayalite.
A stiffener between a stanchion or column and a roof truss, to ensure
greater rigidity in a building frame under wind load. Hammond
a. The triangular connection by which a horizontal motion is changed to a
vertical one, as in certain mine pumps. Standard, 2
b. A stone cut to provide a change of direction. Crispin
c. The return of the dripstone at the spring of an arch. CTD
A protective cushion, usually made of sponge rubber, that can be strapped
to the miner's knee.
a. A bent piece of piping. Fay
b. An angular piece of timber used in a roof (mine) to strengthen a joint
where two timbers meet. Fay
a. Timber with natural knees or angles in it. Webster 3rd
b. A piece of timber with an angle or knee in it. Webster 3rd
N. of Eng. Freestone (sandstone).
A tool that fits around and grips drill rods or any tubular drilling
equipment so they can be pulled or lifted from a borehole where workspace
in narrow underground openings is too confined to allow the use of a
hoisting plug. Long
a. The girdle of a brilliant, cut to a sharp edge and polished.
Hess
b. A narrow ridge of rock or sand. Syn:feather edge
A switch that opens or closes a circuit by the contact of one or more
blades between two or more flat surfaces or contact blades.
Crispin
A chromian variety of alumohydrocalcite.
Crystals of salt mined at Wieliczka, Poland, that decrepitate violently
upon heating, due to excessive enclosed water or gases. Kaufmann
A texture typical of the mineral serpentine in rocks where it replaces a
clinopyroxene. CF:lattice texture
The act of roughdressing stone in the quarry by knocking off the
projections and points. Fay
A bloomery for refining cast iron. Fay
An intergrowth of galena with bismuthinite or stibnite. Hess
To sound the mine roof for competence by rapping.
Crushed lead ore. Arkell
a. S. Wales. Signals made underground by knocking on the coal. Fay
b. Eng. Ore broken with a hammer, esp. the large lumps.
Webster 2nd
See:detachable bit
A laborer who frees solidified metal castings from inverted molds of a
casting wheel by prying the castings from the molds with a long steel bar
to drop them into a water pit (bosh) for cooling. DOT