This stop is mentioned by Wedgwood, who says:

The Harmonic Gemshorn 2 ft. is occasionally made. One particular example at Rugby School Chapel (Bryceson) struck the author as probably the most effective Swell super-octave stop he had heard.

Locher also mentions it: “in Westminster Abbey (W. Hill) there is a 2-ft. Harmonic Gemshorn.” The construction of this stop is not known, but from the name we can postulate that it is both tapered and of harmonic length.

Examples

Harmonic Gemshorn 2', Swell; Winchester College Chapel, Winchester, England; Norman & Beard 1908.

Bibliography