Section 1902. Other districts may join central high school district

Other
  school districts that were not included  in  the  establishment  of  the
  original central high school district may join such district upon a vote
  of the majority of the electors of such district present and voting at a
  district  meeting  duly  called for that purpose and upon the consent of
  the board of education of the central high school district and the order
  of the commissioner of education.