Tenn. Code Ann. § 29-5-110: Umpire

(a) Where, and only where, the submission expressly so provides may an umpire be appointed by the arbitrators; the same to be done by them in writing.

(b) The umpire shall sit with the original arbitrators upon the hearing; if testimony has been taken before the umpire's appointment, the matter must be reheard unless a rehearing is waived in the original submission or by subsequent written consent of the parties.

(c) One (1) or more points in dispute may be referred to an umpire.

Code 1932, § 9363; T.C.A. (orig. ed.), § 23-510.