In 1959 D Alan Stevenson published The World's Lighthouses from Ancient Times to 1820. Stevenson, who died in 1971, was the great grandson of Robert Stevenson, Engineer to the Northern Lighthouse Board, and the fourth in the line of Stevenson's to be involved in lighthouse construction and illumination. Alan Stevenson's namesake, his great uncle, along with another great uncle, Thomas, were close collaborators of James Chance from the 1840s to the 1880s. The names Chance and Stevenson are known throughout t