The board of commissioners of such district shall elect one of their number chair and shall either elect one of their number, or appoint a voter of the district, as secretary, who shall keep minutes of all the district's proceedings. The board of commissioners may issue warrants of such district in payment of all claims of indebtedness against such district, which shall be in form and substance the same as county warrants, or as near the same as may be practicable, and shall draw the legal rate of interest from the date of their presentation to the treasurer for payment, as hereinafter provided, and shall be signed by the chair and attested by the secretary of said board: PROVIDED, That no warrants shall be issued by said board of commissioners in payment of any indebtedness of such district for less than the face or par value.