. Transactions . ofRl. of ME 7MA1-4 ) 113 C and E, were set open, an eddy of hot air and smoke passed down thelower part of the npcast shaft, from H, through K C, and thence throughthe open doors D to E, where it again joined the return air, and, alongwith it, passed over the furnace at F, and so up the upcast shaft to H,the point of its origin, in a continuous eddy. After this a regulator, R, was introduced into the direct return leadingtowards the furnace F. When the area of the opening in the regulator R was 12 square feet,the water gauge between the principal intake and return currents at
. Transactions . ofRl. of ME 7MA1-4 ) 113 C and E, were set open, an eddy of hot air and smoke passed down thelower part of the npcast shaft, from H, through K C, and thence throughthe open doors D to E, where it again joined the return air, and, alongwith it, passed over the furnace at F, and so up the upcast shaft to H,the point of its origin, in a continuous eddy. After this a regulator, R, was introduced into the direct return leadingtowards the furnace F. When the area of the opening in the regulator R was 12 square feet,the water gauge between the principal intake and return currents at L,near the bottoms of the shafts, indicated a pressure of 1*05 inches ofwater column as being the resistance of the workings of the mine to thepassage of the air through them, apart from the shaft resistances ; butwhen the area of the opening to the regulator was reduced to 1\ squarefeet, this pressure (which embraced the resistance offered by the regu-lator) amounted to 1*2 inches of water column. If we presume
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Keywords: ., bookcentury1800, booksubjectmechan, booksubjectmineralindustries
