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
Cape Naturaliste Lighthouse used on the Pilbara coast further north. The lighthouse was constructed of limestone quarried from nearby Bunker Bay, which was also known as the "Quarries". Cape Naturaliste Lighthouse Cape Naturaliste, in the south west of Western Australia, is the site of a lighthouse which was activated in 1904. It is a high cylindrical tower built of limestone that still uses its original first order Fresnel lens made by Chance Brothers. The light characteristic is "Fl. (2) 10 s", i.e. a group of two flashes every ten seconds, the focal plane is at above sea level. Another precious lens optic is