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  2. Barnegat Lighthouse - Wikipedia

    en.wikipedia.org/wiki/Barnegat_Lighthouse

    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.

  3. DSV Alvin - Wikipedia

    en.wikipedia.org/wiki/DSV_Alvin

    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 ...

  4. Tybee Island Light - Wikipedia

    en.wikipedia.org/wiki/Tybee_Island_Light

    This tower was equipped with a 1st order lens. The front beacon was now a 50 ft (15 m) wooden skeleton tower equipped with a new 4th order lens. [2] The main tower was severely damaged in a hurricane in 1871, and developed such serious cracking that a $50,000 appropriation was requested for its replacement. [2]

  5. Lens (hydrology) - Wikipedia

    en.wikipedia.org/wiki/Lens_(hydrology)

    A freshwater lens on an island. In hydrology, a lens, also called freshwater lens or Ghyben-Herzberg lens, is a convex layer of fresh groundwater that floats above the denser saltwater and is usually found on small coral or limestone islands and atolls.

  6. Yerkes Observatory - Wikipedia

    en.wikipedia.org/wiki/Yerkes_Observatory

    The observatory's main dome houses a 40-in aperture (102 cm) doublet lens refracting telescope, the largest refractor ever successfully used for astronomical observation. The Swedish 1-m Solar Telescope in the Canary Islands has a slightly larger 43-in diameter (109 cm) lens but only 39-in (99 cm) clear aperture and is primarily dedicated to ...

  7. Underwater vision - Wikipedia

    en.wikipedia.org/wiki/Underwater_vision

    Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors.. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through

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