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22½-inch kettledrum.

Technical description: Cavalry drum with copper shell; release hole at bottom of bowl; 3 brass loops for carriage straps; 3 fixed legs. Tuning is by a single handle with spring lever engaging a ratchet and indicating a number on the tuning gauge; tuning handle on side operates a metal shaft with 2 screw threads of opposite sense; two threaded metal cross-pieces mounted on screwed rod, each end of both cross-pieces fitted with a pulley; eight laterally-mounted pulley wheels in frames in the bowl with tangential axles; four circumferential external pulleys with radial axles mounted on exterior of bowl; at each of the eight tensioning points there is a hook which is attached to the outside of the flesh hoop and passes through the skin, with loosely mounted pulley on each hook.