Whenever, in the judgment of the city council, the use of any public alley for such purposes is practicable, poles, wires or other necessary fixtures for telegraph, telephone or electric light purposes shall be placed upon and along such alley, instead of upon and along the streets next adjoining and parallel thereto. When such poles or fixtures are set in an alley they shall be located as near the side lines of the alley as practicable and in such manner as not to incommode the public or the adjoining property holders. (Code 1941, Art. 104-2)