Any township located in a county having a population of not less than ten thousand nor more than thirteen thousand and having an assessed tangible valuation of not less than twenty million dollars nor more than twenty-five million dollars, that has heretofore issued its bonds for the purpose of paying for the erection of a township hall, which township hall is located in a city of the third class, and the proceeds of such bond issue have been exhausted prior to the completion of said township hall, is hereby authorized to issue additional bonds of said township for the completion and equipment of such township hall building, in an amount not exceeding the sum of seven thousand five hundred dollars.