1. The commission shall appoint an administrative secretary who shall serve at the pleasure of the commission. The administrative secretary shall keep full and true records of all proceedings of the commission and copies of all rules, regulations, decisions and orders made by the commission and he shall be responsible for the safe custody and preservation of such records and documents. He shall be responsible for the preparation and printing of the annual report as required by section 138.440. Under the direction of the commission the administrative secretary shall superintend the clerical business of the commission, handle correspondence, supervise general office procedures and perform such other duties as the commission prescribes.

2. The administrative secretary shall receive a salary in an amount to be fixed by the commission within the limits of the appropriation made therefor.