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Technical description: Brass; bell without gusset, with French rim. Bow guard with prominent knob. Looped crook without tuning-slide, with tenon acting as a tuning-slide. Shaped pillars to support instrument on both hands; also ring for neck strap. R0 touchpiece controls two keys which open and close simultaneously with a single spring; SATK. Tall chimneys for right hand keys; guard for R1 and R2 keys also limits their opening. Screw adjuster to control opening of bell key. Fitting for music-card holder.; Nominal pitch: C.; Type or system: 9 keys.; Keyhead type: round, slightly cupped and domed.; Keymount type: saddles with channels for springs, apart from keys for R0, R1 and R2 which are rod mounted in pairs.; L0: @I{D.L1: @I{B.L2: @I{C♯.L3: @I{B♭.R0: @I{E.R1: @I{B♭.R2: @I{A.R3: @I{G.R4: @I{F.; Usable pitch: Probably built for use at circa A₄=|435|Hz; converted for use at circa A₄=|452.4|Hz.

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  • Inscriptions:Bell "MEDAILLES / AUX EXPONS. UNIVLLES. / PARIS 1855 / LONDRES 1862" in a circle / sunburst / "J I" / lyre motif / "JULES MARTIN / BREVETÉ / BOULEVARD ST. MARTIN. 4 / PARIS / 3588" (the inscriptions to be read with bell up).
  • Hornbostel-Sachs category:423.213-71 Labrosones with fingerholes and with keys, with (wider) conical bore
  • Repository:Royal Conservatoire of Scotland
  • Measurements:Overall size: 992; bell 235.; Sounding length: 2454 (all keys closed).; Bore: crook at 30mm from mouthpiece receiver (minimum bore) 11.8; crook tenon from 881mm to 982mm from mouthpiece receiver, 32.8; at 1227mm from bell end, c|42.3; at c|775mm from bell end, 60.0.B|=|0.33 (all keys closed).Dia of mouthpiece receiver: m.r.t. 12.45 - 11.95.