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Designs ranged from a "Millet post" with a taller base to a huge 20-foot (6.1 m) double-globe post designed to light plazas and traffic circles. [41] Captain Wood presented a final revised lamppost design to the CFA on November 15, 1923. The post was designed by Wood with input from PEPCO officials.
The statue's internal structure was renovated and its soapstone mosaic covering was restored by removing a crust of fungi and other microorganisms and repairing small cracks. The lightning rods located in the statue's head and arms were also repaired, and new lighting fixtures were installed at the foot of the statue. [27]
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
These lamps emit ultraviolet light with two peaks in the UVC band at 253.7 nm and 185 nm due to the mercury within the lamp, as well as some visible light. From 85% to 90% of the UV produced by these lamps is at 253.7 nm, whereas only 5–10% is at 185 nm. [38] The fused quartz tube passes the 253.7 nm radiation but blocks the 185 nm wavelength.
The concept of a society that uses hydrogen as the primary means of energy storage was theorized by geneticist J. B. S. Haldane in 1923. Anticipating the exhaustion of Britain's coal reserves for power generation, Haldane proposed a network of wind turbines to produce hydrogen and oxygen for long-term energy storage through electrolysis, to help address renewable power's variable output. [15]
When entering the cab, it appears to be any normal elevator ride. However, once the cab begins moving, the interior lights turn off and a special blue light above the cab turns on. This lights the entire shaft, so riders can see the moving cab through its glass ceiling as it rises and lowers through the shaft.
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