Show Magazine a. a Prints ints Mining Article By Dept He HeAn Head An article on mine ventilation written writ writ- ten b by Professor Robert Habert S. S Lewis of oC tho mining department of or tho the University University Uni- Uni appeared In a recent Issue of ot tho the Coal In Industry one of or tho there loading technical magazines of tho the country countr Tho title of or the tho article was Mine Ventilation an and tho the Health of or Miner Miner- and II nd Is an abstract from a pa paper l' l re recently recently re- re by b. Professor Lewis Lewis' before the Utah Ulah Society of or En Engineers Tho The object of ot the tho article was to show how ho greatly the o efficiency of oC tho trio I miners is 18 Increased by proper propel tion In coal mines there has line boon beon no great need for Improvement In tho the present ventilating conditions for tot due duo duoto to tho the great danger of oC explosions in coal mines from tram tho presence of or ex explosive explosive ex- ex plosive gases such sueh a largo large volume of at air rth airis Is kept constantly moving moving mo ing through the mine by the tho aid of oC large ventilating fan fans fang There i is Itt a legal IClal requirement that cu ft It oC of air ah per minute shall be furnished each man or animal working un underground underground under under- er- er ground in coal mines And so 80 In keeping keep keep- ing down tho the concentration of oC dangerous danger danger- ous OUN gases in coal conI mines there U is 18 sum HUm cleat clont moving mo air in the tho mines for tor proper ventilating conditions But in metal mines there thero Is la no groat danger linger I of or explosions occurring bo so no attempt has haH boon been made to force fre fresh h air through tho the mines natural ventilation being UM used d entirely But when no fresh air Js is forced into a mine mino tho the air becomes stagnant and stifling there thoro II Is no cooling effect of or air on opt tho the hod body of at tho the miner mInor and his output as well as his h health alth is handicapped In one largo metal mino where careful observations observations observations ob ob- ob- ob were taken it was found that the output of oC the mine mino wan waa de de'- de' decreased creased 1 l 21 per cent by Improper yen ven yenti ti This particular O example a snows flows the manner in which efficiency is decreased in the metal mines in tho country and because e oC of this Professor sor Bor Lewis laid great emphasis is on the theor importance of or ventilation to increase tho output and protect tho health of oC tho minors miners |