Description3-valve compensating.
Technical description: Silver-plated brass. 3-valve compensating system: 3rd valve brings loop into windway which passes through 1st and 2nd valves, these have short additional loops which are brought into the windway when used in combination with the third valve. Valve type: 3 Périnet-type valves. Repair History: Legs of main tuning-slide extended to lower from Old Philharmonic pitch.
Overall size: 1035; bell 411.
Bore: v.t.s. (1,2,3) 17.6, m.t.s. 18.8 - 23.0.
Dia of mouthpiece receiver: m.r.t. 13.9 - 13.5.
Inscribed on bell "British Plated / CLASS / A / NEW STANDARD / COMPENSATOR" / "50 MEDALS OF HONOUR" within banner / monogram FB / "BESSON & CO / Prototype / LONDON / ENGLAND" / five pointed star / "British Throughout"; on side of valve casings "4", "5" / "BESSON & CO / BREVETE" within ellipse / "129574", "6".
Decorative features: Art deco engraving.
3rd valve tight. Slight crease in bell.
Usable pitch: As modified, plays at A4 = 440 Hz. |