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A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or cloud base. [1] Ceilometers can also be used to measure the aerosol concentration within the atmosphere. [2] A ceilometer that uses laser light is a type of atmospheric lidar (light detection and ranging) instrument. [3] [4]
The arm is mounted onto a curved scale that is marked both in meters and the coded cloud height (feet). The observer looks through the eyepiece and sets the sight onto the spot projected on the cloud and reads the height from the attached scale. When the cloud is thin the beam of light may penetrate into the cloud.
Anduril Industries, Inc. is an American defense technology company that specializes in autonomous systems. It was cofounded in 2017 by inventor and entrepreneur Palmer Luckey and others. [3] [4] Anduril aims to sell to the U.S. Department of Defense, including artificial intelligence and robotics.
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A severe geomagnetic storm brought spectacular light displays to many parts of the United States on Thursday night, with skies as far south as San Antonio bathed in rich hues of magenta and green.
Redfish Bar Light: N/A Galveston: N/A 1854 Never 1936 (Destroyed) None Unknown Redfish Bar Cut Light: N/A Galveston: N/A 1900 Never 1936 (Destroyed) None 39 ft (12 m) Sabine Bank Light: Port Arthur: 1906 1923 2001 (Replaced with skeleton tower) None Unknown Trinity River Light N/A
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