The arbiters shall make their decreet arbitral or award in writing, and shall cause the same to be recorded in the books of council and session, or shall deliver the same to the promoters of the undertaking, to be by them so recorded, and the said promoters shall, on demand, at their own expence, furnish an extract thereof from the said books to the other party to the arbitration; and extracts of decreets arbitral or awards shall bear faith in all courts and cases the same as the original writings, unless the originals be improven.