All warrants issued by the city shall be paid in the numerical order of their issue; that is, first issued, first paid. The warrants must be called for payment when $500.00 has accumulated in any fund with warrants outstanding against it. The call must specify the fund against which the warrants were drawn. No call need be made if the amount accumulated is less than the amount due on the warrant longest outstanding and no more than two calls may be made in any one month. The finance director, at the direction of the city council, shall cause to be published in some weekly newspaper published in the city a notice that certain warrants, specifying the numbers, will be paid if presented to the finance director, and if such warrants are not presented to the finance director for payment on or before the expiration of 10 days from the date of publication and notice, such warrants will then cease to bear interest. From and after the expiration of 10 days from the publication of such notice, all unpaid warrants mentioned herein shall cease to bear interest. (Ord. 2934 § 4, 1976.)