Arthur Edward Johnstone,
Instruments of the Modern Symphony Orchestra…
(1917)
“ The trumpet is a brass instrument, the tube of which is one-half the length of that of the French horn in the same key, and it therefore sounds an octave higher than the horn. The modern orchestral trumpet is provided with the usual three valves, which give it a complete chromatic scale within its compass of about two and one-half octaves. ”
