1851 Great Exhibition: Official Catalogue: Class X.: John Callcott
From Graces Guide
547. CALLCOTT, JOHN, 31 Admiral Terrace, Vauxhall Bridge Road — Inventor and Manufacturer.
Newly invented French horn; the novel feature being its portability, the loose crooks commonly used being dispensed with: to change the key, a continuous tube is graduated into thirteen parts, each part being a semitone, at each of which again an opening is made, into which is inserted a short tube, leading from the belt of the horn to the centre of the hoop, and there turning in any di- rection, which receiving the wind as it passes through the horn bears it away to the belt.
Cornet b, piston, on the same principle.
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