Section, act May 28, 1926, ch. 411, § 2, 44 Stat. 669, provided that the jurisdiction, powers, and duties of the Board referred to in section 405a of this title, its subdivisions and its officers, and their appointment, including the designation of its presiding officers, and the immunities, tenure of office, powers, duties, rights, and privileges of the members of the Board, shall remain the same as provided by existing law.