Xylophone.

Technical description: Bars, width 45, in keyboard layout; tube-resonated; split-frame orchestral model; adjustable depth of resonators for tone adjustment. Adjustment of resonator height is by a mechanical linkage with ratchet position for locking height of resonators. Wooden frame members are mounted in cast aluminium end caps. End caps of frame have four friction cam grips to tension the note-bar strings when assembled. Frame is pressed steel tubes with angle-iron members. Wheels (4 originally) are mounted in castings screwed to the legs of the frame. Lowest bars are undercut in centre to adjust the ratio between 1st and 2nd mode frequencies to 4.0 (i.e. two octaves), and the undercutting reduces progressively to nothing on the highest notes. Some representative measurements are as follows, the mode frequencies inHz:-Note 1st mode 2nd mode ratioC? 261.1 1046.0 4.01F?? 370.6 1479.3 3.99C? 525.9 1970.6 3.75F?? 737.1 2402.3 3.26C? 1036.7 3162.6 3.05F?? 1467.7 4023.8 2.74 Repair History: Frame originally chromed finish, now painted silver.