It shall be unlawful for any person to use an open flame of any character or an electric arc, excepting only when said open flame or electric arc is necessarily employed in the making of repairs, alterations, or structural changes on or in any wharf, pier, dock, bulkhead or marine facility or within any hatch, hold or other space wherein cargo of any character is or may be kept or stored in any vessel on or within the limits of the City and County of San Francisco.
(Added by Ord. 2692, Series of 1939, App. 4/26/44)