1. A person appointed from the copyist register may, upon any test of fitness determined upon by the promoting officer, be promoted as follows:
(a) At any time after probational appointment, to any place the salary of which is not more than $900 per annum.
(b) At any time after one year from the date of probational appointment, upon certification by the Commission that he has passed the clerk examination or its equivalent, to any place the salary of which is $1,000 per annum or more.
(c) At any time after two years from the date of probational appointment, to any place the salary of which is $1,000 per annum or more.
2. A person appointed from the clerk register or from any supplementary or special register to a place the salary of which is $1,000 per annum or more may, upon any test of fitness determined upon by the promoting officer, be promoted at any time after absolute appointment.
3. A person appointed from the clerk register or from any supplementary or special register to a place the salary of which is $900 or less may, upon any test of fitness determined upon by the promoting officer, be promoted at any time after probational appointment to any place the salary of which is $1,000 per annum.
4. Other promotions may be made upon any tests of fitness determined upon by the promoting officer.
5. The provisions of clauses 1, 2, 3, and 4 of this rule shall become null and void in any part of the classified departmental service as soon as promotion regulations shall have been applied thereto under General Rule III, clause 6.
DEPARTMENTAL RULE X.
Upon requisition of the head of a Department the Commission shall certify for reinstatement in said Department, in a grade requiring no higher examination than the one in which he was formerly employed, any person who within one year next preceding the date of the requisition has, through no delinquency or misconduct, been separated from the classified service of that Department.