There shall be paid to each seaman or other person who is sent to the United States from any foreign port, station, sea, or ocean, by any United States minister, chargé d'affaires, consul, captain, or commander, to give testimony in any criminal case depending in any court of the United States, such compensation, exclusive of subsistence and transportation, as such court may adjudge to be proper, not exceeding one dollar for each day necessarily employed in such voyage, and in arriving at the place of examination or trial. In fixing such compensation, the court shall take into consideration the condition of said seaman or witness, and whether his voyage has been broken up, to his injury, by his being sent to the United States. When such seaman or person is transported in an armed vessel of the United States no charge for subsistence or transportation shall be allowed. When he is transported in any other vessel, the compensation for his transportation and subsistence, not exceeding in any case fifty cents a day, may be fixed by the court, and shall be paid to the captain of said vessel accordingly. (R. S. 851.) Manning of merchant vessels. In all merchant vessels of the United States of more than one hundred tons gross, excepting those navigating rivers, harbors, bays, or sounds exclusively, the sailors shall, while at sea, be divided into at least two, and the firemen, oilers, and water tenders into at least three watches, which shall be kept on duty successively for the performance of ordinary work incident to the sailing and management of the vessel. The seamen shall not be shipped to work alternately in the fireroom and on deck, nor shall those shipped for deck duty be required to work in the fireroom, or vice versa; but these provisions shall not limit either the authority of the master or other officer or the obedience of the seamen when, in the judgment of the master or other officer, the whole or any part of the crew are needed for the maneuvering of the vessel or the performance of work necessary for the safety of the vessel or her cargo, or for the saving of life aboard other vessels in jeopardy, or when in port or at sea from requiring the whole or any part of the crew to participate in the performance of fire, lifeboat, and other drills. While such vessel is in a safe harbor no seaman shall be required to do any unnecessary work on Sundays or the following-named days: New Year's Day, the Fourth of July, Labor Day, Thanksgiving Day and Christmas Day, but this shall not prevent the dispatch of a vessel on regular schedule or when ready to proceed on her voyage. And at all times while such vessel is in a safe harbor, nine hours, inclusive of the anchor watch, shall constitute a day's work. Whenever the master of any vessel shall fail to comply with this section, the seamen shall be entitled to discharge from such vessel and to receive the wages earned. But this section shall not apply to fishing or whaling vessels, or yachts. (Mar.