sentences:  The Smalls light was completed in 1861, at a cost of £50,125, and in a record-breaking time of two years.Douglass immediately went on to supervise the construction of the Wolf Rock Lighthouse, designed by James Walker, and was appointed as Engineer-in-Chief of Trinity House in 1862.Douglass's design for the Smalls light was a great success and he went on to design some twenty lighthouses for Trinity House, including some wave-swept towers which remain major engineering achievements, such as the Longships Lighthouse off Land's End.