All payments made by counties and county officers and other public officers to the State Auditor and Inspector for services or expenses in connection with the performance of the lawful duties of this office shall be made by warrant payable to the “State Auditor and Inspector Revolving Fund” and such warrants shall be deposited in the State Auditor and Inspector Revolving Fund. All payments for salaries, compensation, travel expenses, and other expenses of the State Auditor and Inspector and his employees for services or expenses in connection with the performance of the lawful duties of his office with respect to the examination or audit of counties, county funds or other public funds shall be paid by state warrant from such State Auditor and Inspector Revolving Fund to the extent of available funds. From and after the effective date of this act no county, county officer or other public officer shall make direct payment to any employee of the State Auditor and Inspector other than in accordance herewith.