1885 G. B. Shaw in II. 112/1 These slide trumpets are not the instruments Bach wrote for.
1888 XXIII. 594/1 The slide trumpet is mentioned by T. E. Altenburg [1795], who compares it, and with reason, to the alto trombone.
1888 XXIII. 594/1 The slide trumpet is still used in England in a somewhat modified form.