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  1. At present there are no satisfactory substitutes for 32’ and 64’organ pipes, but they require a lot of space and a lot of money. Folo Paril recently suggested a new approach. It is well known that inhaling helium (now considered risky) raises the pitch of the voice. It follows that heavier gases will produce lower pitches from physical systems of identical size. He proposes organ pipes sounding in atmospheres of Xenon or Sulfur Hexafluoride. The speed of sound in air is 343m/s, in Xenon it is 169m/s and in SF6 it is 134m/s. He is currently researching other gases with even lower speeds of
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