W. J. Connell, The Revised Ordinances of the City of Omaha, Nebraska, Embracing All Ordinances of a General Nature in Force April 1, 1890, Together with the Charter for Metropolitan Cities, the Constitution of the United States and the Constitution of the State of Nebraska Page 344, Image 356 (1890) available at The Making of Modern Law: Primary Sources.

Ordinances of Omaha, Concealed Weapons, § 10. It shall be unlawful for any person to wear under his clothes, or concealed about his person, any pistol or revolver, colt, billy, slung-shot, brass knuckles or knuckles of lead, dirk, dagger, or any knife resembling a bowie knife, or any other dangerous or deadly weapon within the corporate limits of the city of Omaha. Any person guilty of a violation of this section shall, on conviction, be fined not exceeding one hundred ($100) dollars for each and every offense; nothing in this section, however, shall be so construed as to prevent the United States Marshals and their deputies, sheriffs and their deputies, regular or special police officers of the city, from carrying or wearing such weapons as may be deemed necessary in the proper discharge of their duties. Provided, however, If it shall be proved from the testimony on the trial of any such case, that the accused was, at the time of carrying any weapon as aforesaid, engaged in the pursuit of lawful business, calling or employment and the circumstances in which he was placed at the time aforesaid were such as to justify a prudent man in carrying the weapon or weapons aforesaid, for the defense of his person, property or family, the accused shall be acquitted.