12. Power to terminate appointments.- Notwithstanding the appointment of a consulting engineer for a specified period under rule 11, the Central Board shall have the right to terminate the services of the consulting engineer before the expiry of the specified period, if, in the opinion of the Board, the consulting engineer is not discharging his duties properly or to the satisfaction of the Board or such a course of action is necessary in the public interest: PROVIDED that the services of a consulting engineer shall not be terminated under this rule by the Central Board except after giving him a reasonable opportunity or showing cause against the proposed action. | 