53 STAT.] 76TH CONG. , 1 ST SESS.-CH. 281 -JULY 15, 1939 necessary expenses incidental to carrying on such work and necessary for the proper execution thereof, including the purchase, exchange, maintenance, and operation of motor vehicles for inspection and transportation purposes, such services and expenses to be paid from said appropriation account: Provided, That the Commissioners may delegate to their duly authorized representatives the employment under this section of laborers, mechanics, and artisans. SEC. 5 . That the Commissioners and other responsible officials, in expending appropriations contained in this Act, so far as possible, shall purchase material, supplies, including food supplies and equip- ment, when needed and funds are available, in accordance with the regulations and schedules of the procurement Division of the Treas- ury Department or from various services of the Government of the United States possessing materials, supplies, passenger-carrying and other motor vehicles, and equipment no longer required. Surplus articles purchased from the Government, if the same have not been used, shall be paid for at a reasonable price, not to exceed actual cost, and if the same have been used, at a reasonable price based upon length of usage. The various services of the Government of the United States are authorized to sell such surplus articles to the municipal government under the conditions specified, and the pro- ceeds of such sales shall be covered into the Treasury as miscella- neous receipts: Provided, That this section shall not be construed to amend, alter, or repeal the Executive order of December 3, 1918, con- cerning the transfer of office materials, supplies, and equipment in the District of Columbia falling into disuse because of the cessation of war activities. SEC. 6. No part of the funds appropriated in this Act shall be available for the payment of rental of quarters for any activity at a rate in excess of 90 per centum of the per annum rate paid by the Dis- trict of Columbia for such quarters on June 30, 1933: Provided, That the provisions of this paragraph shall not apply to leases made prior to the passage of this Act, except when renewals thereof are made hereafter: Provided further, That the appropriations or portions of appropriations unexpended by reason of the operation of this para- graph shall not be used for any purpose, but shall be impounded and eposited in the Treasury to the credit of the District of Columbia. SEC.7. Appropriations contained in this Act shall be used to pay increases in the salaries of officers and employees by reason of the reallocation of the position of any officer or employee by the Civil Service Commission, and administrative promotions within the sev- eral grades: Provided, That the total reallocation increases under such appropriations shall not exceed $35,000 and administrative pro- motions shall not exceed $50,000: Provided further, That such reallo- cation increases and administrative promotions shall be subject to the approval of the Commissioners of the District of Columbia. SEC. 8 . Section 3709 of the Revised Statutes of the United States shall not be construed to apply to any purchase made or service rendered under the appropriations contained in this Act when the aggregate amount does not exceed the sum of $50. SEC. 9 . No part of this appropriation shall be available for any expense for or incident to the issuance of congressional tags except to those persons set out in the Act of December 19, 1932 (47 Stat. 750), including the Speaker and the Vice President. SEC. 10. This Act may be cited as the "District of Columbia Appropriation Act, 1940'. Approved, July 15, 1939. 1041 Proviso. Employment of labor. Material, supplies, vehicles, etc. Purchase. Surplus articles; price basis. Proviso. Transfers under Ex- ecutive order. Rent limitation. Provisos. Prior leases. Unexpended bal- ances to be covered in. Pay increnses by re- alloationl of los tion a n d adnministrative promotions. Prorisos. Limitation. Approval. Minor purchases. R. S. § 3709. 41U.S .C. §5. Congressional tags. 47 Stat. 750. Short title.