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
Hellisøy Lighthouse round cast iron tower is painted red with two narrow white horizontal bands. There is a 3rd order Fresnel lens in the lighthouse that has been in use since 1903. The lens puts out a light with an intensity of 960,000 candela which can be seen for up to . Hellisøy Lighthouse Hellisøy Lighthouse () is a coastal lighthouse in Fedje municipality in Hordaland county, Norway. The lighthouse lies on the small island of Hellisøy, just off the southwest coast of the larger island of Fedje. This tower was built in 1855, making it Norway's second-oldest cast iron lighthouse. It