Whoever willfully or negligently detains or fails to return to a public library any book, magazine, pamphlet, manuscript, picture, clipping or other property belonging to the public library, within thirty days from the date of posting by registered mail of a notice addressed to such person at the last address furnished the public library and which notice may be given at any tine after the date on which such person should have returned the loaned property, in accordance with the rules of such public library, shall be presumed to have converted the same to his own use, and shall be guilty of a minor misdemeanor. However, no penalty shall be imposed in any case where restitution in value shall have been made prior to the expiration of such thirty days period, nor in any case where the return of such book, magazine, pamphlet, manuscript, picture, clipping or other property has been rendered impossible by causes beyond the control of the borrower. (Ord. 68-73. Passed 12-17-73.)