When the office of Registrar id temporarily vacant, who has the power to act as a Registrar till permanent arrangement is made?

Section 10 of Registration Act- When any Registrar, other than the Registrar of a district including a Presidency-town, is absent otherwise than on duty in his district, or when his office is temporarily vacant, any person whom the Inspector-General appoints in this behalf, or, in default of such appointment, the Judge of the District Court within the local limits of whose jurisdiction the Registrar’s office is situate, shall be the Registrar during such absence or until the State Government fills up the vacancy.