Any scaffolds or ladders placed in such a position that they overhang or can fall onto any public street, alley or other public place or way in the City shall be firmly and properly constructed and safeguarded; and it shall be unlawful to place or leave any tools or articles on any such place in such a manner that the same can fall onto such street, sidewalk or other public way from a greater height than four feet (4'). (1972 Code § 132.055)