Section 737(b) in Police Regulations, Bengal , 1943
(b)Method of recruitment. - Vacancies in the rank of Inspector shall be filled by promotion from the ranks of Sub-Inspector and Sergeant. A provincial approved list of Sub-Inspectors and Sergeants fit to be Inspectors shall be maintained in the office of the Inspector-General. A departmental Board consisting of the Inspector-General and the Deputy Inspectors-General in conference shall make selections for this list from nominations obtained from the Deputy Inspectors-General before the conference. Permanent promotions to the rank of Inspector shall be made from this list by the Inspector-General in the order in which the names have been placed in the list by the Board.
