A glossary of mining and metallurgical terms
A glossary of mining and metallurgical terms
A glossary of mining and metallurgical terms
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
A GLOSSARY OF MINING AND METALLURGICAL TERMS. 65<br />
s<strong>and</strong>, from whicli it enters the sows or lateral runners, flowing from<br />
these again into the pig-heds, the separate parallel moulds <strong>of</strong> which<br />
form the pigs. In each bed the ingots lie against the sow likesuek-<br />
ling pigs, whence the two names. See Iron. Mine-pk/ is pig-iron<br />
made from ores only ;<br />
forge or mill-cinder.<br />
Pike. See Pick.<br />
Piking. See Cobbing.<br />
cinder-pig, {"rom ores with admixture <strong>of</strong> some<br />
Pile. 1. The fag<strong>of</strong> or bundle <strong>of</strong> fiat pieces <strong>of</strong> iron prepared to be<br />
heated to welding-heat <strong>and</strong> then rolled. 2. To make up into piles<br />
or fagots. 3. Piles are long thick laths, etc., answering in shafts, in<br />
loose or " quick " ground, the same purpose as spills iu levels, piles<br />
being driven vertically.<br />
Pillar-<strong>and</strong>-sUdl. See Pnsf-<strong>and</strong>-sfall.<br />
Pilz furnace. A circular or octagonal shaft-furnace, maintaining<br />
or increasing its diameter towards the top, <strong>and</strong> having several fay-<br />
eres ; used in smelting lead-ores.<br />
Pinch, Corn. To contract in width.<br />
Pink ash, Peistn. See Coal.<br />
Pipe or Pipe-vein, Derb. An ore-body <strong>of</strong> elongated form.<br />
Pipe-clay, U. S. A fine clay found in hydraulic mines.<br />
Pipe-ore. Iron ore (limonite) in vertical pillars, sometimes <strong>of</strong><br />
conical, sometimes <strong>of</strong> hour-glass form, imbedded in clay. Probably<br />
formed by the union <strong>of</strong> stalactites <strong>and</strong> stalagmites in caverns.<br />
Piping. ]. Pac. See Hydraidicking. 2. The tubular depres-<br />
sion caused by contraction during cooling, on the top <strong>of</strong> iron or steel<br />
ingots.<br />
Pit. 1. A shaft. 2. A stack or meiler <strong>of</strong> wood, prejiared for the<br />
manufacture <strong>of</strong> charcoal.<br />
Pitch, Corn. 1. The limits <strong>of</strong> the set to tributers. 2. The in-<br />
clination <strong>of</strong> a vein, or <strong>of</strong> the longer axis <strong>of</strong> an ore-body.<br />
Pitch-bag, Corn. A bag covered with pitch, in which powder is<br />
inclosed for charging damp holes.<br />
Pit-coal. See Coal.<br />
Pit-eye, Eng. The bottom <strong>of</strong> the shaft <strong>of</strong> a coal-mine; also the<br />
junction <strong>of</strong> a shaft <strong>and</strong> a level.<br />
Pitrcye pillar. A barrier <strong>of</strong> coal left around a shaft to protect it<br />
from caving.<br />
Pit-frame. The framework carrying tiie pit-pulley.<br />
Pitman. 1. CoRN. A man employed to examine the lifts <strong>of</strong><br />
pumps <strong>and</strong> the drainage. 2. Xewc. A working miner.