“ Tall filed a libel, in the District Court at New York, against the steamer Guy, claiming a lien on the boat for repairs made upon her in Baltimore, Maryland, and alleged by the libel to have been necessary to fit her for the prosecution of her then employment, which was, in connection with several other boats, the transportation of the government mails, and of passengers and freight, between Norfolk, Virginia, and Newbern, North Carolina. ”