That Rule related to the appointment to the post of a Deputy Director in Maharashtra Ground Water Service, Class I and the relevant portions of it as is stood in 1983 read as follows: "3.(1) Appointment to the post of a Deputy Director in the Maharashtra Ground Water service Class 1 shall be made either (a) by promotion from amongst Senior Geologists in the Ground Water Surveys and Development Agency of Government, possessing the qualifications mentioned in sub clauses (ii) and (iii) of Clause (c) of this sub rule; (b) by transfer of a suitable officer from the Department of Geology and Mining of Government; (c) by nomination from amongst the candidates who (i) unless already in the service of Government are not more than 45 years of age on the first day of the month in which the post is advertised, and (ii) Possess a post graduate degree in Geology or Applied Geology of a recognised University or Diploma in Applied Geology of the Indian School of Mine, Dhanbad, or any quali fications recognised by Government to be equivalent thereto, and (iii) have practical experience in the field of (a) carrying out systematic hydro geological surveys in ingeneous sedi mentary and metamorphic terrains (b) ground water explora tion and assessment by drilling and testing and (c) process ing, interpretation of field date and in preparing and editing technical reports for a total period of ten years out of which three years.