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Between 1936 and 1940, the gliderport was so popular that San Diego Mayor Percy J. Benbough dedicated the gliderport "to the youth of California" on January 1, 1939. [7] [8] During World War II, the gliderport and its surroundings were transformed into U.S. Army Camp Callan, an anti-aircraft artillery training facility. [9]
Photomicrograph made with a scanning electron microscope and back-scatter detector: cross section of fly ash particles. Fly ash, flue ash, coal ash, or pulverised fuel ash (in the UK)—plurale tantum: coal combustion residuals (CCRs)—is a coal combustion product that is composed of the particulates that are driven out of coal-fired boilers together with the flue gases.
A coal-fired power plant with ash ponds. Bottom ash is part of the non-combustible residue of combustion in a power plant, boiler, furnace, or incinerator.In an industrial context, it has traditionally referred to coal combustion and comprises traces of combustibles embedded in forming clinkers and sticking to hot side walls of a coal-burning furnace during its operation.
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Fly ash bricks. Fly ash brick (FAB) is a building material, specifically masonry units, containing class C or class F fly ash and water. Compressed at 28 MPa (272 atm) and cured for 24 hours in a 66 °C steam bath, then toughened with an air entrainment agent, the bricks can last for more than 100 freeze-thaw cycles.
A chimney cowl or wind directional cap is a helmet-shaped chimney cap that rotates to align with the wind and prevent a downdraft of smoke and wind down the chimney. An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method of regulating draft in situations where prevailing winds or ...
A chimney sweep in Wexford, Ireland in 1850. A chimney sweep is a person who inspects then clears soot and creosote from chimneys. The chimney uses the pressure difference caused by a hot column of gas to create a draught and draw air over the hot coals or wood enabling continued combustion. Chimneys may be straight or contain many changes of ...
Foot travelers frequently diverted south into Mexico, and in 1877 the Southern Pacific Railroad was diverted north to avoid the dunes, but in 1915 Colonel Ed Fletcher built a wooden plank road across the dunes to prove that cars could cross the dunes and to connect San Diego with Yuma, Arizona. This trail eventually became part of Interstate 8.