The board of appeals shall have power and authority to prescribe its own procedure. A full and complete record shall be kept of all proceedings before the board of appeals by the employee of the Department of Labor designated as its clerk. All testimony in any appeal case before the board of appeals shall be taken down by a stenographer, but need not be transcribed unless an appeal is taken to the court. The testimony in hearings on safety rules and regulations, and amendments and repeals thereof, need not be recorded.