Section 1. Be it enacted, &c., That all examinations of the graduating classes at the normal schools shall be conducted by a board, of which the Superintendent of Public Instruction or his Deputy shall be President, of two principals of the normal schools of whom the principal of the school where the students are to be examined shall be one, and not less than two nor more than six county, city, borough or township superintendents, to be appointed by the Superintendent of Public Instruction.