Schriftsteller und Philosoph (1741–1802). Autograph letter signed („JJEngel“). Berlin. 2 SS. auf Doppelblatt. 4to.
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In German to the unnamed engraver Johann Friedrich Bause (1738–1814) concerning a publication in the honour of Duke Leopold. Engel asks Bause to engrave a portrait of the Duke in 4to for this publication. - Engel was appointed professor of moral philosophy in 1776 and belles-lettres in the Joachimstal gymnasium at Berlin, and a few years later he became tutor to the crown prince of Prussia, afterwards Frederick William III.