1911 Encyclopædia Britannica/Sackbut

SACKBUT,, , or  (Scotland, draucht trumpet) or (Fr. saquebute, saqueboute, cacbouc, trompette harmonique; Ger. Posaune, Busaun, Pusin, Zug-Trommet; Ital. tromba da tirarsi or tromba spezzata; Span, sacabuche; Dutch bazuin Schuijftrompette), the earliest form of slide trumpet, which afterwards developed into the trombone. As soon as the effect of the slide in lengthening the main tube and therefore proportionally deepening the pitch of the instrument was understood, and its capabilities had been fully realized, the development of a family of powerful tenor and bass instruments followed as a matter of course. It is not known exactly in what country the principle of the slide was first discovered and applied to musical instruments; if it be not an Oriental device, then the credit is probably due to the Netherlands or to South Germany before or during the 13th century.