All meetings of the zoning board of appeals shall be held at the call of the chairman and at times the board may determine. All meetings conducted by the board shall be open to the public. Any person may appear and testify at a hearing, either in person or by a duly authorized agent or attorney. The chairman, or in his absence, the acting chairman, may administer oaths and compel the attendance of witnesses. The board shall keep minutes of its proceedings, showing the vote of each member upon each question, or if absent or failing to vote, indicating that fact, and shall also keep records of its hearings and other official actions. A copy of every rule or regulation, every amendment or repeal thereof, and every order, requirement, decision, or determination of the board shall be filed immediately in the office of the board, and shall be a public record. The board shall adopt its own rules of procedure not in conflict with this chapter or with the applicable state statutes, and may select or appoint officers it deems necessary.
('69 Code, App. A, § 10.2-3)