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The dust cap (also known as dust dome, or dome) is a gently curved dome mounted either in concave or convex orientation over the central hole of most loudspeaker diaphragms. It protects the inner mechanics (such as the pole pieces and the voice coil ) from small particles (which can cause rubs ) and other contamination.
A dustcap is a small cover used on the valve stem of a bicycle or car tire to prevent dust or other small particles from entering the valve and damaging it. Dustcaps are usually made from plastic but may occasionally be made of metal. The dustcap is internally threaded and is secured by screwing it onto the end of the stem.
The Dorman 2-cylinder (2JO) and 4-cylinder (4JO) engines were the only engines selected for the internal combustion 'rail tractors' used on the War Department Light Railways, these being made by Motor Rail (20 hp and 40 hp variants) with 2-speed gearboxes, and the 40 hp 4JO was used in the petrol-electric locomotives made by Dick, Kerr & Co. and British Westinghouse.
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Dorman has been known for more than 20 years because of his photo-realistic style of oil painting. Dorman's Star Wars: The Art of Dave Dorman cocktail table art book was the top-selling art book in 1996 for Ballantine Books and became the textbook of choice for illustration courses at Northern Illinois University in DeKalb, Illinois. [12]
The amount of dust produced during handling or processing of a powder can be affected by the nature of the handling process, the ambient humidity, the particle size and water content of the powder, and other factors. To measure dustiness of a particular powder in a replicable way, standardized testing procedures have been created and published. [3]