Such sum of money as may be necessary is hereby appropriated out of the general fund in the county treasury, to pay the salary of the purchasing agent and the clerks aforesaid and contingent expenses for the first 2 years after the enactment and taking effect of this act: Provided, That no officer or employe created by this act shall ever use or receive for their own use any provisions, clothing, merchandise or other articles furnished by the county, but that the salaries herein fixed shall be their only compensation, and any person who violates this provision shall, upon conviction, be punished by imprisonment in the county jail for a term of not less than 2 nor more than 10 months.