Johann Ernst Essling, Berlin, (fl. early 1700s).
Brass protractor by instrument maker Johann Ernst Essling. In 1705 Mechanicus Essling entered into employment with the Royal Prussian Academy of Sciences (Königlich-Preußische Akademie der Wissenschaften) for constructing new scientific instruments as well as repairing their existing instruments. In 1718 Essling furnished the Academy with an instrument for drawing ovals for 15 Thalers, as well as a compass for 30 Thalers, and in 1727 he billed the Academy 81 Thalers for repairs to a quadrant.
Under the maker's signature J.E. Essling fec. Berolini, there is added 2 Brüder v. Kleist that seems to indicate the original owners, possibly of the Von Kleist Pomeranian Prussian noble family.