61 Pa.C.S. § 1796

The county commissioners of each county joining in establishing a joint industrial farm and workhouse, as provided for in this subchapter, may incur or increase the indebtedness of the county, in the manner provided by law, to an amount sufficient to pay its proportionate part of the cost of acquiring a site and of erecting, constructing and equipping the joint industrial farm and workhouse by issuing coupon bonds at a rate of interest not exceeding 6% and payable within 30 years from the date of issue. The county commissioners of the county shall levy an annual tax in an amount necessary to pay interest and sinking fund charges upon the bonds.