Valve trumpet. Nominal pitch: F etc.

Technical description: Brass, high-arched distal bow; semicircular proximal bow on tuning-slide. Three-part ball with groove. Distinctive design of mouthpiece receiver ferrule, matches various crooks. With four brass single-coil crooks and three brass bits, one of them curved.Bell wall thicknesses:-Axial location - Nearest Halfway Below garland to ball ballDistance from bell 22 105 185Circumferential location relative to seam -close .37 .42 --90° .37 .40 .41Opposite .39 .42 .4290° .37 .40 .42close .35 -- -- [mean .37 .41 .42] Valve type: 2 finger-slide valves: modification of the Stölzel valve with both ends of the valve casing forming part of the windway; the piston controlled by a touchpiece working in a parallel section of tubing containing the spring with a connecting piece passing through a slot in the side of the valve casing; the windway is diverted through one of two loops on the side of the valve casing, the shorter loop of the two when the valve is not operated and the longer when it is.