Nonconforming uses are declared by this title to be incompatible with permitted uses in the districts in which such use is located. A nonconforming use shall not be extended or enlarged after the effective date hereof by attachment on a building or premises of additional signs intended to be seen from off the premises, or by the addition of other uses of a nature which would be generally prohibited in the district in which such use is located. (Ord. 40, 10-1978, rev. 9-1980)