236. Night shifts.- Where a building worker employed in building or other construction work works on a shift which extends beyond midnight,- (a) a rest day for the purposes of rule 235 shall mean a period of twenty-four consecutive hours beginning from the time when such shift ends; (b) the hours after midnight during which such building worker has worked shall be counted towards the previous day; and (c) the following day shall be deemed to be the period of twenty-four hours beginning from the time when such shift ends. | 
