OBRIEN BROTHERS, Inc., as Owner of THE Dumper SEASHORE, Libelant-Appellee, v. The CITY OF NEW YORK, as Owner of THE Fire Boat THOMAS WILLETT, Respondent-Appellant; The CITY OF NEW YORK, as Owner of THE Fire Boat THOMAS WILLETT, Cross-Libelant-Appellant, v. THE Steam Tug OBRIEN (OBrien Brothers Company, Claimant), Cross-Respondent-Appellee