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
Dassen Island Lighthouse two white flashes, separated by 10 s, every 30 s. The fog horn blasts for five seconds every fifteen seconds. The lighthouse is manned at all times. The island is closed to the general public, but can be visited by special permit. Dassen Island Lighthouse Dassen Island Lighthouse is a lighthouse on the southern point of Dassen Island, west of Yzerfontein. It is a white circular cast-iron tower that has been in use since 1893. The lighthouse is found on southern point of Dassen Island, off the western coast of South Africa, 55 km north-west of Cape Town and 11