Whenever any person applies for authority to be employed as chief mate of ocean or coastwise steam vessels or of sail vessels of over seven hundred tons, or as second or third mate of ocean or coastwise steam vessels, who shall have charge of a watch, or whenever any person applies for authority to be employed as mate of river steamers, the inspectors shall require satisfactory evidence of the knowledge, experience, and skill of the applicant in lading cargo and in handling and stowage of freight, and if for license as chief mate on ocean or coastwise steamers, or of sail vessels of over seven hundred tons, or as second or third mate of ocean or coastwise steamers, who shall have charge of a watch, shall also examine him as to his knowledge and ability in navigation and managing such vessels and all other duties pertaining to his station, and if satisfied of his qualifications and good character they shall grant him a license authorizing him to perform such duties for the term of five years upon the waters upon which he is found qualified to act; but such license shall be suspended or revoked upon satisfactory proof of bad conduct, intemperate habits, unskillfulness, or want of knowledge of the duties of his station or the willful violation of any provision of this title [R. S., 4399-4500]. [See act June 9,1910, p. 351.] (R. S., 444c; Dec. 21, 1898; sec. 3.) Engineer's license. Whenever any person applies for authority to perform the duties of engineer of any steam-vessel, the inspectors shall examine the applicant as to his knowledge of steam-machinery, and his experience as an engineer, and also the proofs which he produces in support of his claim; and if, upon full consideration, they are satisfied that his character, habits of life, knowledge, and experience in the duties of an engineer are all such as to authorize the belief that he is a suitable and safe person to be intrusted with the powers and duties of such a station, they shall grant him a license, authorizing him to be employed in such duties for the term of five years, in which they shall assign him to the appropriate class of engineers; but such license shall be suspended or revoked upon satisfactory proof of negligence, unskillfulness, intemperance, or the willful violation of any provision of this Title [R. S., 4399-4500]. Whenever complaint is made against any engineer holding a license authorizing him to take charge of the boilers and machinery of any steamer, that he has, through negligence or want of skill, permitted the boilers in his charge to burn or otherwise become in bad condition, or that he has not kept his engine and machinery in good working order, it shall be the duty of the inspectors, upon satisfactory proof of such negligence or want of skill, to revoke the license of such engineer and assign him to a lower grade or class of engineers, if they find him fitted therefor. [See act June 9, 1910, p. 351.] (R. S., 4441; May 28, 1896.) Pilot's license.