All sidewalks extending to the curb line, heretofore designated, shall be curbed on the outer edge with cement or concrete, the curb shall be not less in size than five inches on top and beveled one inch to the foot in height and shall net be less than ten inches in the ground from the bottom of the gutter, the top of the curb to be beveled at the outer edge one-fourth of an inch. All sidewalks on corner lots shall continue to the curb lines.
(`90 Code, § 19-12)