E. T. A. Hoffmann - Mastro Pulce

Simple microscopes, 17th century. Simple microscopes by Leeuwenhoek, copy,
Musschenbroete and Depouilly. The Leeuwenhoek is an exact copy of the original,
made before 1673 and in the possession of the University Museum, Utrecht. It
consists of a double convex lens mounted between two concavities, provided with
minute apertures made in two thin brass plates which are riveted together. The
object to be examined is held in front of the lens on the point of a short rod mounted
on a small brass block loosely riveted to a long coarse-threaded screw. Blue
background.