fair; or who delivers any such boiler, steam pipe, or pressure vessel for use, knowing it to be defective in design, material, or construction, shall be fined $1,000. Nothing in this Act shall be so construed as to prevent from being used on such vessels any boiler, steain generator, steam pipe, or unfired pressure vessel which may not be constructed of riveted iron or steel plates: Provided, That scientific data and facts are submitted to enable the board of supervising inspectors to satisfy themselves that such boiler, steam generator, or pressure vessel is equal in strength and as safe from explosion as one of the best quality of iron or steel plates of riveted construction: Provided, however, That the Secretary of Commerce may grant permission to use any boiler, steam generator, or unfired pressure vessel not of iron or steel plate riveted construction upon the certificate of the supervising inspector for the district wherein such boiler, steam generator, or pressure vessel is to be used, and other satisfactory proof that the use of the same is safe and efficient, said permit to be valid until the next regular meeting of the board of supervising inspectors who shall act thereon: Provided further, That such boilers, steam generators, or pressure vessels may be constructed with seamless shells or by means of any approved method of welding governed by the rules and regulations prescribed by the board of supervising inspectors. SEC. 4430. All iron or steel plates, or other material used in the construction of boilers or unfired pressure vessels for use on vessels subject to inspection shall be tested and inspected in such manner as shall be prescribed by the board of supervising inspectors and approved by the Secretary of Commerce, so as to enable the inspectors to ascertain the tensile strength, homogeneity, toughness, and ability to withstand the effect of repeated heating and cooling; and no plate or other material shall be used in the construction of such boilers or pressure vessels which has not been tested, inspected, and approved under the rules and regulations of the board of supervising inspectors: Provided, however, That small unfired pressure vessels having diameters not exceeding thirty inches and subject to a maximum allowable working pressure not exceeding one hundred pounds per square inch shall be exempt from this requirement. 66 The Director of the Bureau of Navigation and Steamboat Inspection may, under the direction of the Secretary of Commerce, detail inspectors to inspect iron or steel plates or other material at the mills where the same are manufactured; and if such plates or material are found in accordance with the rules of the board of supervising inspectors, the inspector shall stamp the same with the initials of his name and the official stamp of the Bureau of Navigation and Steamboat Inspection, which stamp shall be authorized by the board of supervising inspectors; and material so stamped shall be accepted by the local inspectors of the various districts as being in full compliance with the requirements of this section regarding the test and inspection of such plates and material: Provided, That any person, firm, or corporation who affixes any false, forged, fraudulent, spurious, or counterfeit of the stamp herein authorized to be put on by an inspector shall be deemed guilty of a felony and shall be fined not less than $1,000 nor more than $5,000 and imprisoned not less than two years nor more than five years. "SEC. 4431. Every plate of iron or steel, made for use in the construction of boilers, unfired pressure vessels, or riveted steam pipe shall be distinctly and permanently stamped by the manufacturer thereof, and, if practicable, in such places that the marks shall be left visible when such plates are assembled, with the name of the manufacturer, and the minimum tensile strength in pounds per square inch, and the inspectors shall keep a record in their office of the stamps upon all plates, material, and boilers which they inspect. SEC. 4432. Any person, firm, or corporation who counterfeits, or causes to be counterfeited, any of the marks or stamps prescribed for iron or steel plates or other material tested and inspected under this Act, or who designedly stamps, or causes to be stamped falsely, any such plates or material; and every person who stamps or marks, or causes to be stamped or marked, any such plates or material with the name or trade-mark of another, with the intent to mislead or deceive, shall be fined $2,000, and may in addition thereto, at the discretion of the court, be imprisoned not exceeding two years. "SEC. 4433. The board of supervising inspectors is hereby empowered to prescribe formulas, rules, and regulations for the design, material, and construction of boilers, unfired pressure vessels, and appurtenances thereof, and steam piping for use on vessels subject to the provisions of this Act. The maximum working pressure shall be determined by formulas prescribed by the board of supervising inspectors, and no such boiler, pressure vessel, or appurtenance thereof shall be designed or operated where the factor of safety is less than four: Provided, That the minimum thickness and maximum allowable working pressure of valves, fittings, and other appurtenances shall be determined by formulas prescribed by the board of supervising inspectors. "SEC. 4434. The maximum allowable thickness of shell plates and the details of material, design, and construction of externally fired boilers shall be determined by action of the board of supervising inspectors." All laws or parts of laws which may conflict with the provisions of this Act are hereby repealed. Approved, June 13, 1933. [PUBLIC NO. 73-73D CONGRESS] [H. R. 5040] AN ACT To extend the gasoline tax for one year, to modify postage rates on mail matter, and for other purposes. "SEC. 630. EXEMPTION FROM TAX OF CERTAIN SUPPLIES FOR VESSELS "Under regulations prescribed by the Commissioner, with the approval of the Secretary, no tax under this title shall be imposed upon any article sold for use as fuel supplies, ships' stores, sea stores, or legitimate equipment on vessels of war of the United States or of any foreign nation, vessels employed in the fisheries or in the whaling business, or actually engaged in foreign trade or trade between the Atlantic and Pacific ports of the United States or between the United States and any of its possessions. Articles manufactured or produced with the use of articles upon the importation of which tax has been paid under this title, if laden for use as supplies on such vessels, shall be held to be exported for the purposes of section 601 (b)." Approved, June 16, 1933, 1 p. m. [PUBLIC NO. 201-73D CONGRESS) [H.R. 5038] Authorizing pursers or licensed deck officers of vessels to perform the duties of the masters of such vessels in relation to entrance and clearance of same. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That whenever, under any provision or provisions of any statute of the United States, it is made the duty of the masters of vessels to make entry and clearance of same, it shall be lawful for such duties to be performed by any licensed deck officer or purser of such vessel; and when such duties are performed by a licensed deck officer or purser of such vessel, such acts shall have the same force and effect as if performed by masters of such vessels: Provided, That nothing herein contained shall relieve the master of any penalty or liability provided by any statute relating to the entry or clearance of vessels. Approved, May 4, 1934. [PUBLIC-No. 78-73D CONGRESS] SEO. 5. Whenever it shall appear to the President, in respect of any contract entered into by the United States prior to the date of enactment of this Act for the transportation of persons and/or things, that the full performance of such contract is not required in the public interest, and that modification or cancellation of such contract will result in substantial savings to the United States, the President is hereby, upon giving sixty days' notice and opportunity for public hearing to the parties to such contract, authorized, in his discretion, on or before April 30, 1935, to modify or cancel such contract. Whenever the President shall modify or cancel any such contract, he shall determine just compensation therefor; and if the amount thereof, so determined by the President, is unsatisfactory to the individual, firm, or corporation entitled to receive the same, such individual, firm, or corporation shall be entitled to receive such portion thereof as the President shall determine and shall be entitled to sue the United States to recover such further sum as, added to said portion so received, will make up such amount as will be just compensation therefor, in the manner provided for by paragraph 20 of section 41 and section 250 of title 28 of the United States Code: Provided, That where any such contract makes provision for settlement in the event of modification or cancellation, the amount of just compensation as determined hereunder shall not exceed such amount as is authorized by said contract. Any appropriation out of which payments upon the said contract were authorized to be made is hereby made available for the payment of such just compensation. SEC. 6. Hereafter the Postmaster General shall not award any air mail contract or any ocean mail contract under the Merchant Marine Act of 1928 to any individuals, companies, or corporations, which singly or in combination with other individuals, companies, or corporations pay any salary or salary combined with bonus, to any officer, agent, or employee in excess of $17,500. If such individuals, companies, or corporations employ any officer, agent, or employee on a part-time basis, such salary, or salary combined with bonus, shall be reduced in proportion to such part-time employment. Approved, June 16, 1933. [H.R. 6604] AN ACT To establish the composition of the United States Navy with respect to the categories of vessels limited by the treaties signed at Washington, February 6, 1922, and at London, April 22, 1930, at the limits prescribed by those treaties; to authorize the construction of certain naval vessels; and for other purposes. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the composition of the United States Navy with respect to the categories of vessels limited by the treaties signed at Washington, February 6, 1922, and at London, April 22, 1930, is hereby established at the limit prescribed by those treaties. SEO. 2. That subject to the provisions of the treaties signed at Washington, February 6, 1922, and at London, April 22, 1930, the President of the United States is hereby authorized to undertake prior to December 31, 1936, or as soon thereafter as he may deem it advisable (in addition to the six cruisers not yet constructed under the Act approved February 13, 1929 (45 Stat. 1165), and in addition to the vessels being constructed pursuant to Executive Order Numbered 6174 of June 16, 1933), the construction of: (a) One aircraft carrier of approximately fifteen thousand tons standard displacement, to replace the experimental aircraft carrier Langley; (b) ninety-nine thousand two hundred tons aggregate of destroyers to replace over-age destroyers; (c) thirty-five thousand five hundred and thirty tons aggregate of submarines to replace over-age submarines: Provided, That the President of the United States is hereby authorized to replace, by vessels of modern design and construction, vessels in the Navy in the categories limited by the treaties signed at Washington, February 6, 1922, and at London, April 22, 1930, when their replacement is permitted by the said treaties: Provided further, That the President is hereby authorized to procure the necessary naval aircraft for vessels and other naval purposes in numbers commensurate with a treaty navy: Provided further, That the first and each succeeding alternate vessel of each category, except the fifteen-thousand-ton aircraft carrier, upon which work is undertaken, and the main engines, armor, and armament for such vessels, the construction and manufacture of which is authorized by this Act, shall be constructed or manufactured in the Government navy yards, naval stations, naval gun factories, naval ordnance plants, or arsenals of the United States, except such material or parts as were not customarily manufactured in such Government plants prior to February 13, 1929: Provided further, That, if inconsistent with the public interests in any year to have a vessel or vessels constructed as required above, the President may have such vessel or vessels built in a Government or private yard as he may direct. That not less than 10 per centum of the aircraft, including the engines therefor, the procurement of which is authorized by this |