Slide trumpet.

Technical description: silver-plated brass; French bell rim. Smooth ball with three gentle undulations. First yard passes through channel in ball; tuning-slide in distal bow, slightly curved to avoid collision with bell. Slide proximal leg has moving outer; distal leg has moving inner; both inner slides have stockings of length 35mm. With adjustable touchpiece for slide operation with ligature restraint, the touchpiece perforated for thread; expansion spring or elastic slide return.With (468a) curved bit and five single-coil crooks for E (468b), E? (468c), D (468d), D? (468e) and C (468f); the three longest crooks have straight sections and a ferrule-covered joint.; Nominal pitch: F etc.; ; ; ; ; Usable pitch: Probably built for use at circa A?=|452.4|Hz (in F with curved bit); probably built for use at circa A?=|440|Hz (in D with curved bit).;