• Version 1

  • A tube within a tube full of water allows easy adjustment of the length of the air column for resonance with various tuning forks.

        (explain function of felt pad)

  • Version 2

  • A cylinder filled with water at the lower mark will resonate with tuning forks at 341.3 and 1024 Hz, but will not resonate with a 683 Hz fork.

        (allow time for water to reach room temp)