601 Section 16 F of the Act, as it stood prior to August 18, 1975 read thus : "16 F. (1) Subject to the provisions hereinafter specified, no person shall be appointed as a Principal, Headmaster or teacher in a recognised institution unless he (a) possesses the prescribed qualifications or has been exempted under sub section (1) of section 16 E, (b) has been recommended by selection committee constituted under sub section (2) or (3), as the case may be, of the said section and approved, in the case of Principal or Headmaster by the Regional Deputy Director, Education and in the case of a teacher by the Inspector : Provided that if the Inspector is satisfied that for any institution, no candidate, who possesses all the prescribed qualifications, is available for appointment, he may permit the institution to employ as a temporary measure any suitable person for a period not exceeding one year.