Whenever heretofore temporary indebtedness has been created by any school district of the second, third, or fourth class for the purpose of paying teachers' and employes' salaries or for the purchase of supplies or for other services rendered to any such district, and where such indebtedness has been funded by the school district by an issuance of bonds of the district under the provisions of an act, approved the twentieth day of April, one thousand eight hundred and seventy-four (Pamphlet Laws, sixty-five), entitled “An act to regulate the manner of increasing the indebtedness of municipalities, to provide for the redemption of the same, and to impose penalties for the illegal increase thereof,”¹ and the amendments and supplements thereto, such indebtedness and the bonds issued by the school district to fund the same are hereby ratified and declared to be a valid indebtedness of such district, notwithstanding that written contracts with the teachers of the district were not executed in duplicate or that the names of the school directors voting for the motion to employ such teachers or employes or to contract such other indebtedness were not entered upon the minutes of the school district, as required by law.