. Transactions of the Institution of Mining Engineers . MOTOR MAIN-ROPt HAULAGE, 7/ Chains to 1 inch. REFERENCE TO FIG. EDGED WITH FINE LINESFAULTS IN THICK DOT 4 PECK IN SOLID BLACK HAULAGE-ROPES SHOWN IN THIN DOT & PECK LINES. CABLES SHOWN IN FINE DOTTED LINES. DISCONNECTING BOXES ON CABLE-LINE IN WHITE. INTAKE AIRWAYS SHOWN IN THICK DOTTED LINES. RETURN AIRWAYS SHOWN IN THICK LINES. GENERAL DIRECTION OF AIR-CURRENTINDICATED BY ARROWS. DOORS, SHEETS, STOPPINGS, AND AIR-CROSSINGSSHOWN BY USUAL SYMBOLS. PULLEYS WHICH CARRY THE ROPE. RETURN WHE Vo^. XXXK,FLA
. Transactions of the Institution of Mining Engineers . MOTOR MAIN-ROPt HAULAGE, 7/ Chains to 1 inch. REFERENCE TO FIG. EDGED WITH FINE LINESFAULTS IN THICK DOT 4 PECK IN SOLID BLACK HAULAGE-ROPES SHOWN IN THIN DOT & PECK LINES. CABLES SHOWN IN FINE DOTTED LINES. DISCONNECTING BOXES ON CABLE-LINE IN WHITE. INTAKE AIRWAYS SHOWN IN THICK DOTTED LINES. RETURN AIRWAYS SHOWN IN THICK LINES. GENERAL DIRECTION OF AIR-CURRENTINDICATED BY ARROWS. DOORS, SHEETS, STOPPINGS, AND AIR-CROSSINGSSHOWN BY USUAL SYMBOLS. PULLEYS WHICH CARRY THE ROPE. RETURN WHE Vo^. XXXK,FLAr£ IV. T>lf. Ir^ti/^auir,. of Mil TransaolU> To dk/^/j-cUe M! Sgj/iael Di^yles Pape^ o7f Ller/rir l/crulaf/e md the Elwiin/ition of Fit-pomes. Vo^l lxi.,Tl.\te I. FIG. Plan, December, 1920. RETURN WHE. The KidiandInsOO/M- : ;ie/J^ariAAxd Erym&er. Xm: Plate IV 1920-1921.] DISCUSSION HAULAGE AND ELIMINATION OF PIT-PONIES. 71 but instead a little motor attached to each of the machine-tools. Mr.,Diggle has applied that principle to his underground haulage : instead oftaking a strap-rope down the pit from the surface, he has taken a fixedcable, which does not wear out at anything like the same rate as a movingcable. That is one great achievement in the direction of economy—to doaway with the moving strap-rope w4th its wear and tear, and to replaceit by a stationary cable. Through that cable electric current is con-veyed underground, not to one motor, but to a number of motors, whichactuate the respective haulages. That, I think, is a distinct advanceon old-fashioned practice; but whether the cost of the electric current isless or more than the cost of feeding the ponies, Mr. Diggle does notsay. Perhaps before the discussion is ended he will enlighten us inregard to
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
