The French Military Bugle since the early 1800's has been the Clairon
d'Ordonnance: a Fluegel Horn. Do not confuse the term clairon with clarion (an
heraldic trumpet). The clairon is a valveless brass instrument and features a
5.25" - 6" dia. bell, single coil (loop), conically bored tubing, tuneable
receiver with setscrew, key of Bb, and a big sound. Overall length from Bell to
receiver is 19", height is 5.5" without the bell.
American instrument makers copied or imported THOUSANDS of clairons to meet the
needs of ALL Civil War manuever elements....Artillery, Cavalry, Infantry,
Engineers, and even Naval buglers have been photographed with the big-belled
bugle in their hands.