Sec. 16. LEGAL COUNSEL FOR BOARD. The city attorney of any such city shall render such legal service, and without additional compensation, as such pension board may request him to do. The pension board may, if it deems necessary, employ additional legal assistance and pay reasonable compensation therefor, out of said police pension fund. Said pension board, may at its discretion, from time to time, employ the services of an actuary, and pay him reasonable compensation out of said police pension fund.