1.  In pursuance of the requirements of section 7 of the civil-service act, competitive tests or examinations shall, as far as practicable and useful, be established to test fitness for promotion in any part of the civil service of the United States which has been or may hereafter be classified under the civil-service act.

2.  The details regulating promotions shall be formulated by the Commission after consultation with the heads of the several Departments, bureaus, or offices.  It shall be the duty of the head of each Department, bureau, or office when such regulations have been formulated to promulgate the same, and any amendments or revocations thereof shall be approved by the Commission before going into effect.

3.  The Commission shall, upon the nomination of the head of each Department, bureau, or office, designate and select a suitable number of persons, not less than three, in said Department, bureau, or office to be members of a board of promotion.  In the Departments, bureaus, or offices in Washington and in all other offices the members of any board of examiners shall not all be adherents of one political party when persons of other political parties are available and competent to serve upon said board.

4.  Until the regulations herein authorized have been approved for any Department, bureau, or office in which promotion regulations approved by the Commission are not in force promotions therein may be made from one class to another class which is in the same grade and from one grade to another grade upon any test of fitness, not disapproved by the Commission, which may be determined upon by the promoting officer:  Provided, That no promotion of a person shall be made, except upon examination provided by the Commission, from one class to another class or from one grade to another grade if for original entrance to said class or grade to which promotion is proposed there is required by these rules an examination involving essential tests different from or higher than those involved in the examination required for original entrance to the class or grade from which promotion is proposed:  And provided further, That no promotion of a person shall be made, except upon examination provided by the Commission, to a position in which, in the judgment of the Commission, there is not required the performance of the same class of work or the practice of the same mechanical trade which is required to be performed or practiced in the position from which promotion is proposed; but a person employed in any grade shall not because of such employment be barred from the open competitive examination provided for original entrance to any other grade:  And provided further, That no promotion of a person shall be made to a class or grade from original entrance to which such person is barred by the age limitations prescribed therefor or by the provisions regulating apportionment.

  RULE XII.