1851 Great Exhibition: Official Catalogue: Class X.: James Jordan
523. JORDAN, JAMES, 34 Manchester Street, Liverpool — Inventor and Manufacturer.
1. Newly-invented euphonic serpentcleide. The pitch is an octave lower than the ordinary serpent, and the bore being much larger it has a more powerful and mellifluous tone. The keys (eleven) and stays are tubular, thus rendering the instrument extremely light in proportion to its size. The springs, which are spiral, can be regulated or renewed by the performer, a desideratum in the military or naval service.
2. Newly-invented euphonic horn, contra-bass in B flat, compass from double A flat; though more powerful in tone than the ordinary bombardon, is yet more portable, and is consequently peculiarly suited for military, naval, or concert bands.
3. Newly-invented tenor valve ophicleide, silver mounted.
4. Newly-invented German-silver cornopean, with improved transposing slide and water-conductor. On this instrument the keys B flat and A flat (which are the keys most in use by the military) can be produced immediately, thus saving the unnecessary carriage of crooks whilst marching.
5. Newly-invented cornopean. This improvement consists in substituting fixed bows outside the valves for angular turns inside the pistons, without enlarging the tubing, relieving the action from extra weight and friction, and the instrument from leakage.