Principal Chorus Analyzer

Normscale deviation analysis of the principal chorus

Organ Name

Place / Division

Diameter Scales Mouth Width Scales

Paper Size

Pipe Diameters at Octave C′s (mm)

Leave column entries for pitches the stop doesn’t have empty, an 8′ Principal needs nothing under 2⅔′.

Leave column entries for pitches the stop doesn’t have empty, an 8′ Principal needs nothing under 2⅔′.

Enter diameter or mouth width data in their respective columns.
Use “+ Add stop” for each stop in the chorus; the name you give it labels the line in the chart.
Deviations are in half-tones (HT) against the Töpfer normscale — negative is narrower, positive wider.

Courtesy of Rohlfs Pipe Organ Services LLC