DescriptionTechnical description: Silver-plated brass; conical bore through valve loops and coquilles. The bore profile approaches that of a cornet. Two water-keys and fitting for music card holder. Valve type: 3 Périnet valves, top sprung by compression spring inside tubular stem; alignment by unequal legs on spring anchor plate.
Inscribed on bell "CONICAL BORE / PATENTED / E.A. Couturier Co. Ltd. / SOLE MAKERS / LA PORTE / IND"; on each valve stem "1690"; on side of valve casings and on stems "1", "2", "3".
Overall size: 497; bell 115.
Sounding length: minimum 1357.
Bore: mouthpipe at c 25mm from mouthpiece receiver (minimum bore) 9.05; m.t.s. at c 296mm from mouthpiece to receiver, tuning-slide bores 10.85 - 11.15; centre of valve cluster at c 631mm from mouthpiece receiver, bore (1, 2, 3) c 12.0 (no valve tuning-slides); at 679mm from bell end, c 12.3; at c 268mm from bell end, 17.4; at 19.8mm from bell end, 65.5. B = 0.63. Bell cutoff = 1200 Hz.
Dia of mouthpiece receiver: m.r.t. 9.9 - 09.05. |