Whenever two or more township boards authorized by virtue of an election held in such townships in the state of Kansas, as provided in Kan. Stat. Ann. § 80-107, to erect a joint township hall, the township boards of such townships are hereby authorized and empowered for and on behalf of such townships to issue negotiable joint bonds of such townships in a sum not to exceed $30,000, for the purpose of raising a fund to pay for a site and the erection and construction of such joint township hall and such bonds and the proceedings concerning the execution and issuance thereof shall be as provided by law.