David Stevenson (1815-1886)

David and Thomas second and third sons of Robert, spent thirty years as joint engineers to the Commissioners of Northern Lighthouses; the older and younger each holding office singly for one year before and after this period respectively. Messrs Stevenson as they were known built twenty-nine lighthouses, of which the most well-known are Muckle Flugga, North Unst, Dhu Heartach and Chicken Rock, Isle of Man. Thomas was the father of the writer Robert Louis Stevenson who worked for a while as an engineer in the family office.