Lucy tuning

Lucy tuning is a musical tuning based on two musical intervals: the octave, which is 2/1, and the larger note, which is 1/2π octave, or slightly less than a whole tone. The lesser note is then defined so that two lesser notes plus five larger notes equal one octave. It was discovered by Charles Lucy[?] in old writings of John Harrison.

External reference: http://www.harmonics.com/lucy/