1851 Great Exhibition: Official Catalogue: Class X.: J. P. Oates
520. OATES, J. P., Lichfield — Inventor.
Improved brass musical instruments:—
The "gem cornet," model, with the ordinary valves. The improvement consisting in the more direct course of the current through the main tube, a greater proportion of which is placed below the valves.
Cornet, with the "central valve " (invented 1845), f in which the right angles in the open notes are obviated, and the tone improved.
Cornet. Improvement of the last by the introduction of a bow, obviating the angles in the valve note. Invented 1845.
Cornet, with the bulb valves. In the perfect central 1 valve: the piston casing is widened at the turn of the f current by a hollow " bulb," or " bulge," half the diameter of the tube, the other half being formed in the piston.
Cornet, with the "equi-trio-lateral valves."
The "equi-tone cornet."
The "pista-cor," a new drawing-room instrument.
Improved "Sax-horn," upon the equitone principle.
Transposing "military trumpet, combining the C bugle with the E flat trumpet. Both complete instruments.
The "Staffordshire horn."
The seven preceding articles are provisionally registered.