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The lighthouse's beacon remained a first-class navigational light until August 1927 when the Barnegat Lightship was anchored 8 nautical miles (15 km; 9.2 mi) off the coast. This prompted the automation [broken anchor] and replacement of the first-order lens with a gas blinker. As a result, the tower's light was reduced by over 80 percent.
Cataract surgery, also called lens replacement surgery, is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. [1] The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant.
Clear lens extraction, also known as refractive lensectomy, custom lens replacement or refractive lens exchange is a surgical procedure in which clear lens of the human eye is removed. Unlike cataract surgery , where the cloudy lens is removed to treat a cataract , clear lens extraction is done to surgically correct refractive errors such as ...
In December 2018, the Limiting Factor became the first piloted vessel to reach the deepest point of the Atlantic Ocean, [16] 8,376 m (27,480 ft) below the ocean surface to the bottom of the Puerto Rico Trench, an area subsequently referred to by world media as Brownson Deep. [17] DSV Limiting Factor at South Georgia Island
The sunken Alvin on the ocean bottom in June 1969, photographed by USNS Mizar (T-AGOR-11). Alvin , aboard the Navy tender ship Lulu , was lost as it was being transported on October 26, 1968. Lulu , a vessel created from a pair of decommissioned U.S. Navy pontoon boats with a support structure added on, was lowering Alvin over the side when two ...
The introduction of jet airliners in 1958 heralded major change for the ocean liner industry. In 1960 a government-appointed committee recommended the construction of project Q3, a conventional 75,000 GRT liner to replace Queen Mary. Under the plan, the government would lend Cunard the majority of the liner's cost. [34]
Overdue insurance: This is a form of insurance now largely obsolete due to advances in communications. It was an early form of reinsurance and was bought by an insurer when a ship was late at arriving at her destination port and there was a risk that she might have been lost (but, equally, might simply have been delayed).
A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.