Listed only by Audsley, who says: The name which has been sometimes used by the old German organ-builders to designate a Principal, 8 ft., of small scale and soft intonation, so as to distinguish it from the foundation Principal of full scale and tone. The name derives from the word eng, meaning �narrow�. We have also found it at 16' and 4' pitch (see examples below).
Engprinzipal 4', Brustwerk; Kreuzkirche, Dresden, Germany; Gebrueder Jehmlich, Dresden, 1961-3.