Each board of education shall have power to employ engineers, architects and such other employees as it deems essential to the proper and expeditious performance of its duties under this chapter, to fix their salaries and length of service and to dismiss them for any cause which it shall deem sufficient.

29 Del. C. 1953, § 7521; 54 Del. Laws, c. 345; 57 Del. Laws, c. 440, §§ 4, 6; 71 Del. Laws, c. 378, § 123