Technical description: Brass; compensating 4-valve compensating system; 4th valve (for L0) brings loop into windway which passes through 1st, 2nd and 3rd valves which have short additional loops which are brought into the windway when used in combination with the fourth valve. Two fittings for music card-holder (different, so one not original). Valve type: 4 Périnet-type valves, bottom sprung; alignment by key on piston; plated pistons. Repair History: The body has been patched in several places; the main tuning-slide appears to have been extended by c 60mm; the distal outer leg of the 4th valve tuning-slide is a replacement.
General usage of type: According to G. Fischer (Gautrot Aîné, 1867), the purpose of the 4th valve was to extend the compass. The principle of the `instruments système équitonique' patented in France by Gautrot in 1858 is exactly the same as the principle of `compensating pistons', patented in Britain by D.J. Blaikley in 1878.
R. Parks, 12.8.00, m.r.t. 28.10.00; A. Myers, bore 19.8.00.
581; bell 178.
ex- Bruno Kampmann Collection.; on loan to the Collection.