ยง 278. Authority to transfer school library property to a free library. The board of education in any city or union free school district or the electors of any other district, by legal vote duly approved by the regents, may give to any free library any of the books or other public school library property not required in such school library, provided such free library is registered by the regents and situated in such city or district; and the school authorities or body making the transfer shall thereafter be relieved of all responsibility pertaining to the property so transferred.