Double flageolet

"Stamped: Bainbridge Inventor 35 Holborn Hill London New Patent. On silver keys the London hallmark from 1829 and the maker's mark W.B. Two boxwood pipes, the right-hand pipe longer than the other, held in a wide head joint with two shut-off keys and ivory mouthpiece. Ivory mounts, silver keys. The holes in the left pipe are marked from the highest B, A, G, F, E, D. A key located high up on the pipe is marked D key , and the three keys near the bottom are marked F [natural], D# and C# , the last being an open key pivoted at its lowest end. The right pipe holes are marked G, F, E, D, and the keys B (near the top). C, Low B key (open key at the back of the pipe), and Low key C (closed key in front). Below the last of these keys is a vent hole. Below the shut-off key on the left side NEW C KEY and NEW D KEY . It is to these that 'NEW PATENT presumably refers." - Anthony Baines: Catalogue of Musical Instruments in the Victoria and Albert Museum - Part II: Non-keyboard instruments. (London, 1998), pp. 89-90.