Every person, firm or corporation by whom, or under whose immediate direction or authority, either as principal, contractor, superintendent, employer or employee, any portion of any public street may be made dangerous, must erect, and so long as the danger may continue, maintain around the portion of such street so made dangerous, a good and substantial barrier, and cause to be maintained at each end of such barrier, during every night, from sunset until daylight, a lighted lantern. (Ord. 19 § 1, 1923)