Alto fagotto

"Of dark-stained wood, in four joints arranged as those of a bassoon, though the bell is short and has an internal flange at the mouth. The seven round brass keys are mounted on brass saddles save for those on the long joint, which are mounted on blocks in the wood of the joint. The keys are: on the wing joint, one for the thumb and one for the little finger (C sharp); on the butt, F, A flat, and on the back F sharp; on the long joint, which has an ivory-bushed C hole, keys for D and (outside this) for E flat. The brass crook is bent in a right angle and adds 14 cm of tune-length when inserted." Anthony Baines, Catalogue of Musical Instruments in the Victoria and Albert Museum - Part II: Non-keyboard instruments(London, 1998), p. 99.