Ships. Executive order [authorizing suspension of provisions of law requiring survey, inspection, and measurement, by officers of United States, of foreignbuilt ships admitted to United States registry so that said provisions shall not apply to any such foreign-built ship during period of 18 months from Sept. 1, 1919, provided Secretary of Commerce is satisfied in case of any such ship that ship is seaworthy and that proper effort is being made to comply with said provision].