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Battens are also used in metal roofing to secure the sheets called a batten-seam roof and are covered with a batten roll joint. [2] Some roofs may use a grid of battens in both directions, known as a counter-batten system, which improves ventilation. Roofing battens are most commonly made of wood or metal, but can be made of other materials.
The 16th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Wednesday, May 30, 1928. This was the first Indianapolis 500 presided over by new Speedway president Eddie Rickenbacker.
The performance of fluorescent lamps is critically affected by the temperature of the bulb wall and its effect on the partial pressure of the mercury vapor within. [33] Since mercury condenses at the coolest spot in the lamp, careful design is required to maintain that spot at the optimum temperature, around 40 °C (104 °F).
The earliest known form of stage lighting was during the early Grecian (and later the Roman) theaters. They would build their theatres facing east to west so that in the afternoon they could perform plays and have the natural sunlight hit the actors, but not those seated in the orchestra.
The 1927 Grand Prix season was the third (and final) AIACR World Manufacturers' Championship season and the second run to a 1.5-litre engine limit. In a dominant display, the championship was won by Delage, with team driver Robert Benoist winning four of the five Grand Prix.
The 1966 RAND corporation memorandum The Effects of Nuclear War on the Weather and Climate by E. S. Batten, while primarily analysing potential dust effects from surface bursts, [72] notes that "in addition to the effects of the debris, extensive fires ignited by nuclear detonations might change the surface characteristics of the area and ...
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