Judgment

BHARGAVA, J.-This appeal by Messrs, Aluminium Corporation of India Ltd., Calcutta, filed by special leave, is directed against an award of the Fourth Industrial Tribunal, West Bengal, in an industrial dispute relating to payment of bonus for the year 1958-59 to the workmen employed in the appellant s factory at J. K. Nagar, and the Head Office at Calcutta. The workmen were represented by (i) The Aluminium Mazdoor Union, J. K. Nagar, District Burdwan, and (ii) The Aluminium Corporation s Calcutta Employees Association, Calcutta. The Tribunal calculated the surplus available for distribution of bonus on the basis of the Full Bench Formula approved by this Court in the case of The Associated Cement Companies Ltd,, Dwarka Cement Works, Dwarka v. Its Workmen and Another. The appellant had granted voluntarily bonus equivalent to l/16th of the annual basic wages. In this appeal, the award is challenged on only two grounds. One is that the Tribunal wrongly rejected the claim of the appellant for return on reserves employed as working capital, and the second is that the Tribunal was also wrong in disallowing rehabilitation charges in respect of buildings and machinery of the appell