[City of Denver,] Charter and Ordinances: Offenses Affecting Public Safety, § 1. If any person shall, within this city, fire or discharge any cannon, gun, fowling piece, pistol or fire arms of any description, or fire, explode or set off any squib, cracker, or other thing containing powder or other combustible or explosive material, without permission from the Mayor (which permission shall limit the time of such firing, and shall be subject to be revoked by the Mayor or City Council at any time after the same has been granted), every such person shall, on conviction, be fined in a …