English: Tenor-bass valve trombone in 9′ B♭ with fourth valve for F, built c. 1910 in Brussels, Belgium; composite, by Sénécaut and Persy. In the collection of St Cecilia's Hall Concert Room & Music Museum, Musical Instruments Museums Edinburgh. Photographed by Antonia Reeve. Licensed CC-BY, attribution "University of Edinburgh"; accession number 3339. Colour adjusted for white background. Brass, long model. Tuning-slide in distal bow. With extension piece fitting between body and tuning-slide. Extension piece differs a little from instrument in details of design and workmanship, suggesting that it was not part of the original but was added only slightly later. No tuning-slide in bell section. Wide loop at end of 4th v.t.s. Wired bell rim, no garland. Fitting for music card-holder on mouthpipe. With water-key on distal bow. R1: 2 semitones. R2: 1 semitone, R3: 3 semitones, R4: perfect fourth. Valve type: Four Système Belge double-piston valves, in line. Overall size: 1134 mm; bell 183 mm. Sounding length; m.t.s. increases sounding length by up to 164 mm; extension piece increases sounding length by a minimum of 236 mm, and its tuning slide can add a further 148 mm. Bore: at c. 90 mm from mouthpiece receiver (minimum bore), 11.6 mm; distance to m.t.s. c. 640 mm, m.t.s. bore 12.0 mm; v.t.s. (4, 3, 2, 1) 12.0 mm. Diameter of mouthpiece receiver: m.r.t. 12.2-11.9 mm. Inscribed on bell "LE TRIOMPHE / 945" / five-pointed star / "FABRICATION / Supérieure / & / Artistique / J. PERSY / BREVETÉ / BRUXELLES" / five-pointed star; on valve section at mouthpipe "P. SENECAUT / 2055". One nut from base of touchpiece rod missing.