In arriving at the amount of negotiable bonds outstanding and authorized to be issued under this subchapter, revenue bonds and certificates which are payable solely from the revenues of any utility or facility or public work of the city, and that do not pledge or authorize the city to make any tax levy for the payment of the revenue bonds or certificates or the interest thereon, shall not be considered.
(Special Acts, Ch. 57-1754, § 181) ('58 Code, § 45.119)