fresnel pattern
81Newburyport Harbor Light — The current tower, built in 1898. U.S. Coast Guard photo Location Newburyport, Massachusetts Coordinates …
82Chandeleur Island Light — 1971 Location Chandeleur Islands, Gulf of Mexico, Louisiana Year first constructed 1848 Year first lit 1896 (most recent tower) Automated 1951? Deactivat …
83Cuttyhunk Light — The 1915 Lighthouse, USCG photo Location Cuttyhunk, Massachusetts Coordinates …
84Lange Jaap — Lange Jaap …
85Dunkirk Light — Location Point Gratiot on Lake Erie Year first constructed 1826 Year first lit 1875 Automated 1960 Foundation Dressed Stone Construction Rubblestone encased in brick Tower shape Square Marki …
86Manitou Island Light Station — Undated USCG photo of the station Location Manitou Island, Michigan Year first constructed 1861 Year first lit 1862 Automated 1978 Construction Iron Tower shape …
87Marshall Point Light Station — Marshall Point Light Location Port Clyde, Maine Year first constructed 1832 Year first lit 1857 Automated 1980 Foundation Granite blocks Construction Granite and brick Tower shape …
88Mount Desert Light — The 1847 (current) tower with the 1892 keeper s house. Location South of Mount Desert Island, Maine Year first constructed 1830 Year first lit 1847 (current tower) …
89Owls Head Light — Station Location Owls Head, Maine Year first constructed 1826 Year first lit 1826 Automated 1989 Foundation Granite Construction Brick Tower shape …
90Diffraction grating — A very large reflecting diffraction grating. In optics, a diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams travelling in different directions. The directions of these beams …
