PUBLIC LAWS-CH. 343-JUNE 13, 1940 Consulting engi- neers. Payments under contracts. 53 Stat. 643, 608,995. Contracts author- ized. Prviso. Reserve officers, etc., to active duty. Operating bridges, etc. Repairs of arsenals. Post, pp. 378, 602, 803, 874, 969. Oases, gas masks, etc. Part-time employ- ment of scientists, etc. Construction, etc., of buildings. Special gas troops; training Army in chemical warfare. Projectile filling plants, etc. subscriptions to periodicals; for services of not more than four con- sulting engineers as the Secretary of War may deem necessary, at rates of pay to be fixed by him not to exceed $50 per day for not exceeding fifty days each, and for their necessary traveling expenses, $302,422,312, of which not to exceed $46,000,000 shall be available for payments under contracts for the procurement or production of ordnance matkriel, machinery and supplies under the authorizations contained in the Second Deficiency Appropriation Act, fiscal year 1939, the Military Appropriation Act, 1940, and the Supplemental Military Appropriation Act, 1940; also, in addition, the Chief of Ordnance, when authorized by the Secretary of War, may enter into contracts prior to July 1, 1941, for the procurement or production of ordnance materiel, machinery, and supplies to an amount not in excess of $133,774,679, and his action in so doing shall be deemed a contractual obligation of the Federal Government for the payment of the cost thereof: Provided, That the President may, with their con- sent, order Ordnance Reserve Officers and Specialist Reserve Officers assigned to the Ordnance Department to active duty for such periods as may be necessary to carry out the purposes of this appropriation, and the pay and allowances of such officers while so assigned shall be charged to this appropriation. ROCK ISLAND BRIDGE, ROCK ISLAND, ILLINOIS For operating, repair, and preservation of Rock Island bridges and viaduct, and maintenance and repair of the arsenal street connecting the bridges, $32,835. REPAIRS OF ARSENALS For repairs and improvements of ordnance establishments, and to meet such unforeseen expenditures as accidents or other contingencies may require, $3,776,541. CHEMICAL WARFARE SERVICE For purchase, manufacture, and test of chemical warfare gases or other toxic substances, gas masks, or other offensive or defensive materials or appliances required for gas-warfare purposes; investiga- tions, research, design, experimentation, and operation, purchase of chemicals, specal scientific and technical apparatus and instruments, including services connected therewith; for the payment of part-time or intermittent employment of such scientists and technicists as may be contracted for by the Secretary of War, in his discretion, at a rate of pay not exceeding $20 per diem for any person so employed; for the purchase, maintenance, repair, and operation of freight- and passenger-carrying motor vehicles; construction, maintenance, and repair of plants, buildings, and equipment, and the machinery therefor; receiving, storing, and issuing of supplies, comprising police and office duties, rents, tolls, fuels, gasoline, lubricants, paints and oils, rope and cordage, light, water, advertising, stationery, type- writing and adding machines including their exchange, office furni- ture, tools, and instruments; for incidental expenses; for civilian employees; for libraries of the Chemical Warfare Service and sub- scriptions to periodicals; for expenses incidental to the organization, training, and equipment of special gas troops not otherwise provided for, including the training of the Army in chemical warfare, both offensive and defensive, together with the necessary schools, tactical demonstrations, and maneuvers; for current expenses of chemical pro- jectile filling plants and proving grounds, including construction and maintenance of rail transportation, repairs, alterations, acces- [54 STAT.