Nothing contained in this chapter shall prevent any local board from paying an additional amount of salary to any employee when such additional amount is derived from local funds or from Division III appropriations.

46 Del. Laws, c. 48, § ?10; 47 Del. Laws, c. 195, § ?1; 14 Del. C. 1953, § ?1304; 50 Del. Laws, c. 602; 56 Del. Laws, c. 292, § ?8;