Section 31. Hours of work beJow ground. —(I) No adult employed below ground in a mine, except n pump-minder, an

31. Hours of work beJow ground. —(I) No adult employed below ground in a mine, except n pump-minder, an onsetter or attendant of continuously operated machinery, shall be allowed to work for more then forty-eight hours in any week or for more than oif(ht hours in any day. (2) No adult escepted under sub-section (2) shall be allowed to work for more than tifLy-foiir hours in any week or for more than nine hours i?i any day. (H) Work of tin.[1] same kind shall not be oarried on below ground in nuy nine for a period spreading over more than eight hours in the case of adults rofVnvd to in sub-section (1), and nine hours in the ense of adults referred to in sub-section (3), in any day except by a system of relays so arranged that the periods of work for each relay are not spread over more than the hours stipulated hi sub-section (1) or sub-secliou ('•.'), as the c;ise may be. (4) No adult employed in a mine shall be allowed io be in any part of a mine below ground, except dining (lie periods of work shown in respect of him in the reg'star kept under sub-section (1) of section 48. 33. Special provision ior night relays.—Where a worker works in a relay -whose period of work extends over midnight, the ensuing day foi him ghull be deemed to be the period of twenty-four hours beginning at the end o£ the period o( work fixed for the relay, and the hours he has worked after midnight shall be counted towards the previous day.