Arthur Edward Johnstone

“ Two cornets in addition to two trumpets, were then employed, their special function being to supply the chromatic tones lacking on the plain trumpet.
Owing to its ease of blowing and its pleasing, mellow tone, the cornet is still much used in amateur and in professional small orchestras; also in military bands. It is made in B flat and is provided with a slide or a valve mechanism which instantly transforms it into an "A" instrument. In compass and in the manner of writing it is precisely like the valve trumpet. ”