Report of the Department of Mines of Pennsylvania . RT OF THE DEPARTMENT OF MINES Off. Doc. Number of persons employed inside M 18 « 8 s OM Number of cubic foot of air perminute passing 0it at outlet i, :: § 5 Total number of cubic feet of air perminute circulating in all the splits Number of cubic feet of air per minute entering tbe mine at inlet Number of splits of air currents Area of furnace barfc in square feet ss & 1 5 w ! » !! ^ CQ l ^ ! ? e, 1 e= Q 0 1 C! 1 S M 1 1 ii ! 1 rower used Name of fan Water gauge developed—in inches Number of revolutions per minute . o o o Depth of blade
Report of the Department of Mines of Pennsylvania . RT OF THE DEPARTMENT OF MINES Off. Doc. Number of persons employed inside M 18 « 8 s OM Number of cubic foot of air perminute passing 0it at outlet i, :: § 5 Total number of cubic feet of air perminute circulating in all the splits Number of cubic feet of air per minute entering tbe mine at inlet Number of splits of air currents Area of furnace barfc in square feet ss & 1 5 w ! » !! ^ CQ l ^ ! ? e, 1 e= Q 0 1 C! 1 S M 1 1 ii ! 1 rower used Name of fan Water gauge developed—in inches Number of revolutions per minute . o o o Depth of blades in feet and inches Width of blades in feet and inches Diameter of fan in feet and inches Method of ventilation Gaseous or non-gaseous fafa h fa fa fa fa fa fa X fa Kind of opening Zi5 y. z y. 5?: s. X ~s. Z 15 DO P P P R P p Q D 5 =3 u ;< ^< *»a a a d O CD - H o o o,3 S3 M •5 TS £ °3 c . oa 55 - S «2 oS b 6 e No. 23. TWENTY-EIGHTH BITUMINOUS DISTRICT 999 rfrnate number of tons pro-duced by machines o o 5 oo *-t « Ej i i-i. 1000 REPORT OF THE DEPARTMENT OP MINES Off. Doc. Approximate number of tons pro- jduced by maehiues c=> CD s 1 s 1 s => * o 9 in OS LOCO H en 8 >, o S I Thinnest JJ a-3 i §g« I j Thickest Average thickness in inches 3 : U ™ 33 a 8 p : ° CO CS -r o? l* £i g : CO SS wr- , IS)
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
