The Secretary of Labor shall have charge in the buildings or premises occupied by or appropriated to the Department of Labor, of the library, furniture, fixtures, records, and other property pertaining to it or acquired for use in its business. He shall be allowed to expend for periodicals and the purposes of the library and for rental of appropriate quarters for the accommodation of the Department of Labor within the District of Columbia, and for all other incidental expenses, such sums as Congress may provide from time to time.