Basset horn. Nominal pitch: F.

Technical description: Boxwood with ivory ferrules and brass keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Mouthpiece of cocus wood with a long table, grooved for cord with 18grooves. Curved wooden barrel with two ivory ferrules. Upper section: Keys in brass saddles, spectacle for L2 and L3 controlling a vent to improve forked B♭. Straight speaker, liner projects c5mm into bore. Lower section: R3 ring replaced by a plate and link allowing B touchpiece for L4 to hold down the C key. Chromatic extension with C and D open-standing for R4 and C♯ and D♯ closed-standing for R0. Brass rollers on L4 touchpieces and basset C key. Shaped thumbrest with a ring. Straight bell. L0: T; speaker. L1: T; throatA♮; throatA♭. L2: T + spectacle. L3: T + spectacle; cross E♭/B♭. L4: C♯/G♯; E/B♮; F♯/C♯. R0: basset C♯; basset D♯, R1: T; side F/ C; side trill key for throatA-B♮ and B♭-C. R2: T + spectacle. R3: Plate + spectacle (forked B♭/F♮); cross B♭/F♮ . R4: G♯/E♭; F/C. Keymount type: metal saddles and screwed-in pillars. Keyhead type: saltspoon.