English slide trumpet. Nominal pitch: F etc.
Technical description: The tubing of gilding metal or red brass with yellow brass ferrules, ball, mechanism etc. Twin drum clock springs for slide; closed slide position adjustable by multi-toothed end-stop. Crooks of gilding metal or red brass; single-coil. The tuning bit is of yellow brass.Bell wall thicknesses:-Axial location - Nearest Halfway Below garland to ferrule ferruleDistance from bell 25 125 200Circumferential location relative to seam -close -- .20 --90° .21 .21 .19Opposite .20 .20 .1890° .17 .19 .19close .18 .19 .22 [mean .19 .20 .20]