. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world . Blowing \Fan Wheel \. — N Exhausting ^I^X \ \ Fig. 10. force it into, the mines. Fig. 10 shows a Bul-lock Champion ventilator which may be usedas an exhauster or a blower, as circumstancesmay require. It consists of a fan-wheel, whichmay be driven by belting or by a direct con-nected steam engine or other motor, and a hood and attendant diaphragm that may berevolved independently of the motion of thefan wheel, by a hand wheel, thus changing
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world . Blowing \Fan Wheel \. — N Exhausting ^I^X \ \ Fig. 10. force it into, the mines. Fig. 10 shows a Bul-lock Champion ventilator which may be usedas an exhauster or a blower, as circumstancesmay require. It consists of a fan-wheel, whichmay be driven by belting or by a direct con-nected steam engine or other motor, and a hood and attendant diaphragm that may berevolved independently of the motion of thefan wheel, by a hand wheel, thus changing thecurrent at will from exhausting to blowing orvice versa. Mine haulage.— Up to a very recent period, thecoal cut by the various machines already describedhas been hauled from the side headings orrooms to the shaft bottoms almost exclusivelyby mules, but they are being rapidly supplantedby improved systems of steam haulage in theanthracite coal regions, and electric haulage inthe bituminous drift mines adopted to meet thedemands of various conditions which necessi-tate haulage systems of greater speed and powerthan that afforded by the use of mules. The solution of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1903
