John Smeaton He pioneered the use of 'hydraulic lime' (a form of mortar that will set under water) and developed a technique involving dovetailed blocks of granite in the building of the lighthouse. His lighthouse remained in use until 1877 when the rock underlying the structure's foundations had begun to erode; it was dismantled and partially rebuilt at Plymouth Hoe where it is known as Smeaton's Tower. Deciding that he wanted to focus on the lucrative field of civil engineering, he commenced an extensive series of commissions, including: Smeaton is considered to be the first expert witness to appear in an English
Dyrhólaey lighthouse prefabricated in Sweden. The present lighthouse was built in 1927. The light flashes white every 10 seconds. Dyrhólaey lighthouse The Dyrhólaey lighthouse () is a lighthouse located on the central south coast of Iceland. The Dyrhólaey lighthouse consists of a square concrete tower, painted white with red trim. Integral keepers quarters are placed on the left and right sides of the tower. A red metal lantern house is placed on top of the tower. The focal plane of the light is . The overall height of the tower is . The site (but not the tower) is open to visitors.