law: 3. Mischief causing damage to public property.-
  (1) Whoever commits mischief by doing any act in respect of any public property, other than public property of the nature referred to in sub-section (2), shall be punished with imprisonment for a term which may extend to five years and with fine.
  (2) Whoever commits mischief by doing any act in respect of any public property being-
  (a) any building, installation or other property used in connection with the production, distribution or supply of water, light, power or energy;
  (b) any oil installations;
  (c) any sewage works;
  (d) any mine or factory;
  (e) any means of public transportation or of tele-communications, or any building, installation or other property used in connection therewith, shall be punished with rigorous imprisonment for a term which shall not be less than six months, but which may extend to five years and with fine:
  Provided that the court may, for reasons to be recorded in its judgment, award a sentence of imprisonment for a term of less than six months.