1855—England/Austria

In Novello’s translation of Albrechtsberger’s collected writings, J. G. Albrechtsberger’s Collected Writings on Thorough-bass, Harmony, and Composition, edited by Seyfried, the overtone series and range of the alto trombone is diagrammed, clearly showing an instrument in E-flat. The overtone series diagram begins with 6th position and proceeds to 1st (see below image; public domain) (Albrechtsberger-Novello 253).