Bell Rock Lighthouse
illustration by "Miss Stevenson"
Alan Stevenson: <i>Biographical Sketch of the Late Robert Stevenson: Civil Engineer</i>. W. Blackwood, 1861. Online: <a rel="nofollow" class="external text" href="https://books.google.com/books?id=YSBGZ7ozsHMC&amp;pg=PA1">Google Books</a>