Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . The diameter of the lowest course is 42 ft., that of the top course 16 ft., and the whole height is 138ft. The tower for a height of 26 ft. is solid. Immediately above the solid part the walls are 9i , and they gradually diminish from this thickness to 2 ft. The material is granite, and the toweris surmounted by a bronze lantern in which is placed a Fresnel lens of the first order, showing a re-volving light. The work was commenced in 1839, and the light was first shown in Febr
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . The diameter of the lowest course is 42 ft., that of the top course 16 ft., and the whole height is 138ft. The tower for a height of 26 ft. is solid. Immediately above the solid part the walls are 9i , and they gradually diminish from this thickness to 2 ft. The material is granite, and the toweris surmounted by a bronze lantern in which is placed a Fresnel lens of the first order, showing a re-volving light. The work was commenced in 1839, and the light was first shown in February, account of the construction of the work has been published by Mr. Stevenson, which is valuablenot only for the description of this particular work, but because it contains a dissertation on theFresnel system of lighthouse illumination, and a succinct history of lighthouses. Figs. 2808, 2809,and 2810 show the comparative sizes and shapes of the Eddystone, Bell Rock, and Skerryvore light-houses. The high and low waters of ordinary tides are indicated on the figures, and the letter Ggives the
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
