Five of the six ranks of pipes on the Great manual are clearly visible. Most obvious are the triangular pipes of the Hohl Flute. The triangular section allows a much wider mouth to the pipe in proportion to its cross-sectional area, which creates a hollow tone.

The other stops on the Great are:
Open Diapaison (8ft)
Dulciana (8ft)
Lieblich Gedact (8ft)
Principal (4ft)
Lieblich Flute (4ft)

8ft stops sound at normal pitch, 4ft stops an octave higher.