“Puffs of Air: Communicating by Vacuum” In John Knechtel, Ed., AIR, Alphabet City #15 (Cambridge: MIT Press, 2010) on pneumatic tubes
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Puffs of Air: Communicating by Vacuum

“Puffs of Air: Communicating by Vacuum” In John Knechtel, Ed., AIR, Alphabet City #15 (Cambridge: MIT Press, 2010) on pneumatic tubes