stopped diapason

Stopped Diapason.

In smaller organs, a Bourdon or Stopped Diapason may be substituted for a Tibia Clausa at 16' pitch.

It can occasionally be found at 8' although this is generally unnecessary as many stopped flute/flue pipes, such as the Gedackt and stopped Diapason, give a similar sound.

The organ has four ranks of oak pipes (Stopped Diapason 8, Principal 4, Twelfth 22/3 and Fifteenth 2) contained in a rectangular ornamented chest with the keyboard at the top.

The pipework consists of some of the original Bishop ranks, some second hand pipework from Hill Norman & Beard's stock in 1964 and one partly new stop - the Great Stopped Diapason.

The andante is delicately scored for pianissimo strings senza cembalo (without harpsichord) with three stops on the organ - open diapason, stopped diapason and flute - another indication that these concertos were intimate chamber works.