Concertina

A larger patent prototype model of the 'Table top' foot treadle powered concertina, patented by Wheatstone in 1844 but never put into production. Two separate prototype system fingerboards are mounted on top of a wind chest which is inflated by a treadle on the four-legged support table. Rectangular flat rosewood ends, 8.94x9.69in/227x246mm, each with rectangular frieze of damaged fretwork. The ends are secured by eight long brass bolts. Prototype system fingerboards with 69 tall ivory buttons: 32 left-hand, 37 right-hand; black accidentals, in the prototype layout of the 1844 patent. Brass double riveted tongues on square brass beds, screwed onto the underside of the action board. Foot treadle operates bellows, with wind chest to control pressure. Instrument mounted on four-legged support table. No label or serial number.