408 GLOSSARY. 



Pit-top. The structures about the mouth 01 a .siiatt. 



Pit water. The moisture found in freshly mined coal, which is lost 

 by exposure to ordinary atmospheric conditions. 



Place. The portion of a coal face allotted to a hewer. 



Post. (1) Clayey sandstone. (2) See "Prop." 



Primer. The small plug placed on the top of a charge of high 

 explosive in which the detonator is embedded. 



Prop. A vertical stick of timber used as a temporary support for 

 the roof. 



Bake of sk'nis. A number of skips connected together that form a 

 set or train. 



Hums. (1) The plunder of a pump. (2) A mechanical device for 

 pushing hot coke out of an oven. 



Regulator. A door in a colliery by means of which the ventilation 

 of a district may be regulated. 



Meliyhtiny xlatiun. Places underground where safety lamps that 

 have become extinguished may be relighted. 



Met urn tunnel. A tunnel used as a return airwav. 



M-ib. A narrow pillar of coal left as a support. 



Mider. See Cross-head. 



Mise. Working to the rise is when one works on an up-grade. 



Roadman. Men who lay tracks, see that they are kept in order, 

 and who attend to various odd jobs below. 



Moadiruy. An underground passage, whether used for haulage 

 purposes or for men to travel to and from their work. 



Molls. When earth stresses cause the floor of a seam to form wavr- 

 like folds, wliich thins out the coal at their crests. 



Hoof. The rock immediately above a coal seam. 



Hope drive. When ropes take the place of belts for driving 

 machinery. 



Hound coul. Coal which passes over screens, with bars ^in. apart. 



Mubbing bars. liars placed on the side of a cage nearest to the-* 

 other cage when rope guides are used. The buffer ropes are placed 

 outside the rubbing bars. 



Mun-away switch. A switch by means of which a run-away truck 

 can be side-tracked. 



Hun-of-mine. Coal as broken in the mine. 



Runner. See Cross-head. 



Running bridye. A platform on wheels which serves as a cover 

 for a shaft in process of sinking, and on which buckets or skips are 

 landed. 



Safety catch. An appliance attached to a cage so that should the 

 hoisting rope break, the catches grip guides, thus preventing the ea.iv> 

 from falling. 



Safety detaching hook. A self-acting device, which releases the 

 cage from its hoisting rope in case of an overwind. 



Safety jnxe. A core of fine gunpowder enea.sed in a tube of tape 

 and tar, used for exploding holes. 



Sdff.ty lamp. A miner's lamp, protected in such a manner that the 

 heat of the flame is not communicated to the explosive mixture of gases 

 outside. 



Screen. An apparatus for sizing coal. 



Screened cool. Coal that has passed over a screen and had the 

 slack separated from it. 



Screen Men. Men who attend to the tippler and screening of coal. 



Scotches. A surajj; or brake for skip. 



^fdliny a mine. The air-tight closing of the entrances to a coal 

 mine, resorted to in time of fire. 



Scorn. A bed of coal. 



Second r back e.r]>loxion . Supposed to be due to the ignition of 



