748 Section 10(2) (vi) of the Act, to the extent it is material is as follows "(2) Such profits or gains shall be computed after making the following allowances, namely: (vi) in respect of depreciation of such buildings machinery, plant or furniture being the property of the assessee, a sum equivalent, where the assets are ships other than ships ordinarily plying on inland waters, to such percentage on the original cost thereof to the assessce as may in any case or class of cases be prescribed and in any other case, to such percentage on the written down value thereof as may in any case ,or class of cases be prescribed; Provided that (a). . (b). . (c) The aggregate of all allowances in res pect of depreciation made under this clause and clause (vi a) or under any Act repealed hereby, or under the Indian Income tax Act, 1886 (II of 1886), shall, in no case exceed the original cost to the assessee of the buildings, machinery, plant or furniture, as the case may be;" Keeping in view sub section