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Lampchanger in the Maughold Head Lighthouse, Isle of Man. This is a model NALC-89, produced by Nav-Aids Systems, LTD, in Kent, England. An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist.
Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.
From the statistics, North America's optoelectronics market grew to more than $20 billion in 2003. The LED (light-emitting diode) market is expected to reach $5 billion in 2007, and the solid-state lighting market is predicted to be $50 billion in 15–20 years, as stated by E. Fred Schubert, [18] Wellfleet Senior Distinguished Professor of the ...
The valve was the key component of the Dalén light used in lighthouses from the 1900s through the 1960s, by which time electric lighting was dominant. Prominent engineers, such as Thomas Edison, doubted that the device could work. The German patent office required a demonstration before approving the patent application. [1]
The Twilight Sentinel system uses a photoelectric cell to measure ambient light levels. This cell is typically mounted on the dashboard of the vehicle. [7] The system is designed to activate the vehicle's exterior lights when the ambient light falls below a certain threshold, typically corresponding to twilight conditions.
Sapelo Island Light in Georgia, the oldest surviving Lewis lighthouse . A resident of Wellfleet, Massachusetts, Lewis began developing his ideas during the embargo of American shipping during the Napoleonic wars. He created a new lighting system based on Argand lamps; in 1812 the United States Congress purchased his patent rights for the system ...
Norah Head Light, detail showing the bluestone balcony and the bivalve lens. The lighthouse is a 27.5 metres (90 ft) tower, made from concrete blocks. The concrete blocks were made on the ground using a local aggregate, lifted and cemented into position and finally cement rendered inside and out with deep ashlar coursing, and painted white ...
The Black Rock Harbor Light was an active navigational aid until 1933 when it was replaced by two automatic lights offshore. The beacon was subsequently given to the City of Bridgeport in 1934. Two significant efforts during the 1980s and 1990s served to restore the aging tower and the light was relit as a non-navigational aid in 2000.