Bass clarinet. Nominal pitch: B♭.

Technical description: Blackwood with german silver crook, ferrules, keywork, and bell. Five pieces: mouthpiece, crook, upper section, lower section, and upright bell. Two speaker keys: one straight speaker with a chimney on top of the upper section to give throat B♭ when depressed with the throat Akey. The second speaker has a chimney on the crook and is used to overblow. Device for a music card holder on top of the upper section. Pinned for strength. All tone-holes covered. Shaped thumb rest. Sling ring. 14keys, 7covered tone-holes, 2red rollers on L4levers. L0: Plate; speaker 1 + 2. L1: Plate; throat A♮; throat A♭. L2: Plate. L3: Plate; cross E♭₄/B♭₅. L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅. R1: Plate; side F₄/ C₆; side E♭₄/B♭₅; side trill key for throat A-B♮ and B♭-C. R2: Plate + spectacle. R3: Plate + spectacle (forked B♭₃/F♮₅); cross B♭₃/F♮₅. R4: G♯₃/E♭₅; F₃/C₅. Keymount type: screwed in pillars. Keyhead type: modern.