law: General Clauses Act, 1897
  19. Officials chiefs and sub-ordinates
  (1) In any 12[Central Act] or Regulation made after the
  
  commencement of this Act, it shall be sufficient, for the purpose of expressing
  
  that a law relative to the chief or superior of an office shall apply to the
  
  deputies or subordinates lawfully performing the duties of that office in the
  
  place of their superior, to prescribe the duty of the superior.
  (2) This section applies also to all 12[Central Acts] made after
  
  the third day of January, 1868, and to all Regulations made on or after the
  
  fourteenth day of January, 1887.