THE WILLIAM F. HUMPHREY. THE POTTER. TIDE WATER ASSOCIATED OIL COMPANY, Owner of Steamship William F. Humphrey, Libellant-Appellee, v. UNITED STATES of America, Owner of Motor Vessel Potter, Respondent-Appellant; UNITED STATES of America, Cross-Libellant-Appellant, and Glens Falls Insurance Company et al., Intervenors-Appellants, v. Steamship WILLIAM F. HUMPHREY, Her Engines, Boilers, etc., Tide Water Associated Oil Company, Claimant-Appellee