State responsibility — Kinds of — For taking of, or interference with, property — Confiscation of currency — Russian currency confiscated at time when it had no value — Responsibility of Soviet Government — Imperial Russian Treasury Bills circulating on a par with currency — As result of Soviet Government Order, 1918 — Whether Bills to be treated as currency — Loss of goodwill as result of nationalization of company — Whether compensable — Relevance of possibility of accurate determination of loss — Valuation of confiscated property — Machinery — Allowance for depreciation — Furniture and equipment — Relevance of length of period of use prior to confiscation.