Section 4
SEC. 4. The holders of licenses as master, mate, or engineer under the laws of the United States shall be eligible to appointment to like positions under this Act. The examination of every applicant shall be in writing and shall include a thorough examination as to his knowledge of seamanship and navigation in its various branches, his capacity and skill in lading and unlading cargo, in handling and storing freight under all conditions, and his knowledge generally of the duties of the position which he seeks.