At each annual meeting, the board shall revise the salary schedule so far as it shall deem such action necessary. From time to time between annual meetings, whenever required by any judge, county officer or executive head of any separate board, commission or division, the number or compensation of whose deputies, assistants, clerks and employes is sought to be fixed, and board shall meet and consider and shall fix and determine the same. All salaries fixed under the provisions of this act shall be paid out of the county treasury.
16 P.S. § 4824