Section 369. Certain cities; appointment of experts; compensation

The
  commissioner of health or health officer in cities having  a  population
  of less than one hundred seventy-five thousand, with the written consent
  of  the  mayor  and subject to the approval of the board of estimate and
  apportionment or other board having similar powers in  such  cities  and
  the  common council or similar legislative authority in cities having no
  boards of estimate and apportionment or authorities with similar  powers
  may  temporarily  employ  such  health  and  sanitary  experts as may be
  necessary  at  a  compensation  fixed  by  the  board  of  estimate  and
  apportionment or other authority having power by charter to fix salaries
  of appointive officials.