As chief architect to Harland and Wolff it was one of Thomas Andrews self-imposed duties to sail on the maiden voyage of every ship he designed for the purpose of such 'trouble-shooting' exercises -- a habit that cost him his life less than a year later when he was on board Titanic for the same purpose. He was known as a highly concientious man and would trust no one else to complete the task to his standards, as perhaps is borne out by this document where even the smallest alterations are a priority. The alternate page numbering suggests that the example offered is a second carbon, the original manuscript and first carbons presumably filed with the company and his personal files.