Any person in the service of the city by appointment under civil service rules who shall wilfully, or through culpable negligence, violate this part, and who shall be found guilty after a trial before the civil service board shall be dismissed from the service of the city, and shall not be subject to reappointment for two years. Any officer or employee of the city other than those holding office under the civil service rules, who shall wilfully or through culpable negligence, violate this part, shall be guilty of a misdemeanor, and on conviction shall be fined in a sum not less than fifty dollars ($50), nor more than five hundred dollars ($500), unless same be otherwise provided therein, and the office so held by such person, by force of such conviction, shall be rendered vacant, and such person shall not again be allowed to hold any office or place of employment under the city thereafter for two years. Any other person who shall wilfully, or through culpable negligence violate this part shall be guilty of a misdemeanor, and shall on conviction be punished by a fine in the sum of not less than fifty dollars ($50) and not exceeding five hundred dollars ($500).