Every person in control of any inn, hotel, apartment house, rooming house or lodging house in the city shall keep at all times a register for the registration of guests, which said register shall be a substantially bound book not less than nine inches in length and not less than seven inches in width, with pages thereof lined for the registration of guests; and which book of registration of guests shall be preserved for at least one year after it is filled with registrations or after the discontinuance of its use as a register; and every such register shall be kept open during use and shall, at all times, be subject to inspection by police officers or other members of the Police Department. (Ord. 1142 § 1 (part), 1961).