(a) The Board of Appeals shall adopt rules necessary to the conduct of its affairs, and in keeping with the provisions of this Zoning Ordinance. Meetings shall be held at the call of the chairman and at such other times as the Board may determine. The chairman, or in his absence the Acting Chairman, may administer oaths and compel the attendance of witnesses. All meetings shall be open to the public.
(b) 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 such fact, and shall keep records of its examinations and other official actions, all of which shall be a public and be filed in the office of the Board. Every decision of the Board shall be based upon a finding of fact based on sworn testimony, which finding of fact shall be reduced to writing and preserved among its records.