Calculated on these bases, the costs are as follows: — Labour per day — £ s. d. 3 Winding-engine men (8 hour shifts) 0 16 6 1 Engine-cleaner .
Experience has shown that each locked-coil winding rope will raise at least 300,000 tons of coal, and that the guide ropes will last equally long.  Calculated on these bases, the costs are as follows: — Labour per day — £ s. d. 3 Winding-engine men (8 hour shifts) 0 16 6 1 Engine-cleaner .  .