This article shall apply in a county having a population of more than 490,000 and less than 503,000, as determined by the 1960 federal census. The judges of the superior and municipal courts of such county, a majority concurring, may appoint as many regular official phonographic reporters as may be necessary to report the proceedings in the courts of the county and to perform such other duties as are prescribed by law. The number of reporters so appointed shall not exceed the number of offices of judges provided by law for superior and municipal courts of such county. Such reporters shall hold office during the pleasure of the judges of such court, a majority concurring.