SECTION 15. It shall be unlawful for any person other than a policeman or other officer authorized to maintain the peace and to serve process to carry or wear any pistol, slungshot, knuckles, bowie knife, dirk or any other dangerous weapon, and any person convicted of a violation of this section shall be punished by a fine not exceeding one hundred dollars. In all cases of conviction hereunder, any and all dangerous weapons found on the person of the accused shall be confiscated and become the property of the city of La Crosse, and may be sold for the benefit thereof at such times and in such manner as the common council may from time to time direct.