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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.
Since a lens can only be held in place by its edge, the center of a large lens sags due to gravity, distorting the images it produces. The largest practical lens size in a refracting telescope is around 1 meter (39 in). [35] There is a further problem of glass defects, striae or small air bubbles trapped within the glass.
A 40 cm rise in sea level can have a drastic effect on the shape and thickness of the freshwater lens, reducing its size by up to 50% and encouraging the formation of brackish zones. Saline plumes can form at the bottom of the freshwater aquifer when the lens thickness is compromised by drought and saltwater intrusion.
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Hatch cover clearance – Hatch cover clearance refers to how many "High Cube" (height over 8.6 ft (2.6 m)) containers allowed to load in the hold without preventing the hatch cover from closing correctly. [3] Visibility – The number of High cube containers shouldn't exceed a set number of High cube containers in each row/bay on-deck.
Motor-deployed capture latches of two different designs (fast- and slow-acting, having short- and long-reach, respectively) were mounted on the outboard radius. Outward-oriented guide petals were also located on the outboard radius, giving the mechanism an overall diameter of about 85 inches. [71] NASA Artist's Concept of Modules (January, 1989).
The Corrective Optics Space Telescope Axial Replacement (COSTAR) is an optical correction instrument designed and built by NASA. It was created to correct the spherical aberration of the Hubble Space Telescope ' s primary mirror , which incorrectly focused light upon the Faint Object Camera (FOC), Faint Object Spectrograph (FOS), and Goddard ...