House arranged with the Admiralty that the workers would be immune from the press. Each worker was issued a medal to confirm he was a worker at the lighthouse. The lighthouse was in height, and had a diameter at the base of and at the top of . As lighthouse After the structure was completed, the lighthouse's 24 candles were lit on 16 October 1759. Each candle weighed between . A timepiece placed alongside the light was set to chime every half-hour (30 min), alerting the lighthouse keeper to the need to replace expired candles. The lighthouse candles were replaced by oil lamps and reflectors from 1810. Further major renovations were carried out in 1841 by engineer Henry Norris, including the filling of a hole in the rock close to the tower's foundation. Four years later the oil lamps and reflectors were replaced with and improved lamp and Fresnel lens assembly. The lighthouse remained in use until 1877, when it was discovered that rocks upon which it stood were becoming eroded. Each time a large wave hit, the lighthouse shook from side to side. As memorial Smeaton's Tower ceased operation in February 1882 following the installation of a temporary light atop its successor (Douglass's Tower), then under construction on an adjacent rock. In 1882, the upper part of Smeaton's Tower was dismantled and rebuilt as a memorial to Smeaton on a new base on Plymouth Hoe, replacing the triangular obelisk that had been built there by Trinity House as a navigation aid in the early 19th century. The site was opened to the public by the Mayor of Plymouth on 24 September 1884. The foundation and stub of the old tower remain on Eddystone Rocks, close to the current lighthouse. Since the foundation proved too strong to be dismantled, it was left where it stood. In 1860, a new penny coin was brought into circulation on which the lighthouse was depicted in the background behind Britannia, remaining on the penny until 1894. The lighthouse was also depicted on a number of tokens issued during the 19th century in Devon with face values from two pence to one shilling. An 1850 replica of Smeaton's lighthouse, Hoad Monument, still stands above the town of Ulverston, Cumbria as a memorial to naval administrator Sir John Barrow. On April 19, 1913, a home-made bomb with the words 'votes for women' and 'death in ten