Improvement of the magic lantern and solar microscope
According to Jacobi, a treatise with this title was read to the Berlin Academy on March 19, 1750. According to St. Petersburg Academy records, it was presented to that Academy on April 30, 1750.
Original Source Citation
Novi Commentarii academiae scientiarum Petropolitanae, Volume 3, pp. 363-380.
Opera Omnia Citation
Series 3, Volume 6, pp.22-37.