The services of draftsmen, assistant engineers, levelers, transitmen, rodmen, chainmen, computers, copyists, overseers, and inspectors temporarily required in connection with sewer, water, street, street-cleaning, or road work, or construction and repair of buildings and bridges, or any general or special engineering or construction work authorized by appropriations may be employed exclusively to carry into effect District of Columbia appropriations when ordered by the Mayor of the District of Columbia in writing, and all such necessary expenditures for the proper execution of said work shall be paid from and equitably charged against the sums appropriated for said work; and the Mayor in his budget estimates shall report the number of such employees performing such services, and their work, and the sums paid to each, and out of what appropriation; provided, that the expenditures hereunder shall not exceed $42,000 during any 1 fiscal year; provided further, that, excluding Inspectors in the Sewer Department, 1 inspector in the Electrical Department, and 1 Inspector in the Repair Shop, no person shall be employed in pursuance of the authority contained in this section for a longer period than 9 months in the aggregate during any 1 fiscal year.

The Mayor of the District of Columbia, or his duly designated representatives, are authorized to employ temporarily such laborers, skilled laborers, drivers, hostlers, and mechanics as may be required exclusively in connection with sewer, water, street, and road work, and street cleaning, or the construction and repair of buildings and bridges, furniture and equipment, and any general or special engineering or construction or repair work, at per diem rates of pay to be fixed and adjusted from time to time by a wage board and approved by the Council of the District of Columbia, and to incur all necessary engineering and other expenses, exclusive of personal services, incidental to carrying on such work and necessary for the proper execution thereof, said laborers, skilled laborers, drivers, hostlers, and mechanics to be employed to perform such work as may not be required by law to be done under contract, and to pay for such services and expenses from the appropriations under which such services are rendered and expenses incurred.

All horses, harness, horse-drawn vehicles necessary for use in connection with construction and supervision of sewer, street, street lighting, road work, and street-cleaning work, including maintenance of said horses and harness, and maintenance and repair of said vehicles, and purchase of all necessary articles and supplies in connection therewith, or on construction and repair of buildings and bridges, or any general or special engineering or construction work authorized by District of Columbia appropriations, may be purchased, hired, and maintained, and motortrucks may be hired exclusively to carry into effect said appropriations, when ordered by the Mayor of the District of Columbia in writing; and all such expenditures necessary for the proper execution of said work, exclusive of personal services, shall be paid from and equitably charged against the sums appropriated for said work; and the Mayor in the budget estimates shall report the number of horses, vehicles, and harness purchased, and horses and vehicles hired, and the sums paid for same, and out of what appropriation; and all horses owned or maintained by the District shall, so far as may be practicable, be provided for in stables owned or operated by said District; provided, that such horses, horse-drawn vehicles, and carts as may be temporarily needed for hauling and excavating material in connection with works authorized by appropriations may be temporarily employed for such purposes under the conditions named in § 9- 1209.02 in relation to the employment of laborers, skilled laborers, and mechanics.

The Mayor of the District of Columbia is authorized to employ in the execution of work, the cost of which is payable from the appropriation account created in the District of Columbia Appropriation Act, approved April 27, 1904, and known as the miscellaneous trust fund deposits, District of Columbia, necessary personal services, horses, carts, and wagons, and to hire therefor motortrucks when specifically and in writing authorized by the Mayor, to establish and fix fees to be charged for such work, maintain operating balances, and to incur all 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 or operating balances; provided, that the Mayor may delegate to his duly authorized representatives the employment under this section of laborers, mechanics, and artisans.