21. The space factor for stranded rope is . . . . . . . .
22. Untwisting of strands prevented by . . . . . . . .
23. If the failure of detaching hook to hold the cage, the next safety device may be fitted in head gear is . . . . . . . .
24. The pressure developed by each impellar varies, as the square of . . . . . . . .
25. The thrust of the pump is counter acted by . . . . . . . .
26. In the direct haulage system, which is generally employed up a gradient steeper than . . . . . . . .
27. In shearer, the power source is . . . . . . . .
28. Double drum balanced haulage system reduces . . . . . . . .
29. . . . . . . . . of the circumferance of the rope is in contact with the groove of the head gear pulley.
30. The plates in oremerod safety hook is assembled on a centre pivot and a copper rivet . . . . . . . . mm diameter passes through a small hole of all the plates when assembled.
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