§ 10. Offices of commission; meeting; stationery, et cetera. The principal office of the public service commission shall be in the city of Albany, in rooms designated by the commissioner of general services. The public service commission shall also maintain a branch office in the city of New York. The commission shall hold stated meetings at least once a month during the year at its office. The offices shall be supplied with all necessary books, maps, charts, stationery, office furniture, telephone and telegraph connections and all other necessary appliances, to be paid for in the same manner as other expenses authorized by this chapter.