Board may adjourn to consider decision
9.  The Board may on conclusion of the hearing of an appeal adjourn for any period for the purpose of considering its decision. After any such adjournment the decision shall be in writing signed by the members of the Board who heard the appeal. Such decision may be delivered by any member of the Board who was present at the hearing and it shall not be necessary for the members of the Board who heard the appeal to reassemble merely for the purpose of delivering a decision.