And be it enacted, That in case of Absence, from necessary Cause, of any Principal Clerk, his Duties may be discharged by any of the remaining Principal Clerks, or by any Person appointed by the Division of the Court to which such Principal Clerk may belong either from among the Assistant Clerks in the Inner House or the Depute Clerks in the Outer House; and all Interlocutors which have been or shall hereafter be written by any such Persons so appointed and acting under Authority of the Court, being duly signed, shall be and they are hereby declared to be valid and effectual, any Law or Practice to the contrary notwithstanding.