Section 130. Commissioner of public safety; appointees

The commissioner of
  public safety shall be the head of the department of public  safety.  He
  may  appoint,  to  hold  office  during his pleasure, a deputy, a health
  officer and a superintendent of buildings. Whenever a vacancy occurs  in
  the  office  of the chief of police or chief of the fire department, the
  commissioner of public safety,  shall  appoint,  in  his  discretion,  a
  person  deemed by him to be suitable and competent to fill the same. The
  chief of police and chief of the fire department shall each hold  office
  during  good  behavior,  or  until permanently incapacitated or unfit to
  discharge  his  duties.    The  commissioner  may  appoint  such   other
  subordinates  as  may  be  prescribed  by  the  board  of  estimate  and
  apportionment to hold office,  except  as  otherwise  provided  by  law,
  during  his  pleasure.  In  case  of  the  absence  or disability of the
  commissioner or a vacancy in the office, the deputy shall discharge  the
  duties  of  the  office  until  the commissioner returns, his disability
  ceases or the vacancy is filled. Before entering upon the  discharge  of
  the duties of their respective offices, the commissioner, deputy, health
  officer,  superintendent  of buildings, chief of police and chief of the
  fire department shall each execute and  file  with  the  city  clerk  an
  official  undertaking  in  such  penal  sum  as may be prescribed by the
  common council.