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Acoustic transmission lines — An acoustic transmission line is the acoustic analog of the electrical transmission line, typically thought of as a rigid walled tube that is long and thin relative to the wavelength of sound present in it. Pipe organs, woodwinds, and the like… … Wikipedia
Pneumatic motor — The Victor Tatin airplane of 1879 used a compressed air engine for propulsion. Original craft, at Musée de l Air et de l Espace … Wikipedia
Speaking tube — A speaking tube or voicepipe is a device based around two cones connected by an air pipe through which speech can be transmitted over an extended distance. While its most common use was in intra ship communications, the principle was also used in … Wikipedia
