15.148.560   Glass.
   When glass is used for sign letters or transparent panels it shall be at least double strength thickness for sign areas up to and including three hundred (300) square inches. When glass is used for sign letters or transparent panels for sign areas in excess of three hundred (300) square inches at least one-quarter inch wire glass shall be used and the maximum span between supports shall be four feet. (Prior code § 3.06.125)