Keywords: Equatorial sundial, Johann Gottfried Zimmer, Reinharz, c. 1760 - Mathematisch-Physikalischer Salon, Dresden - DSC08110.JPG en Exhibit in the Mathematisch-Physikalischer Salon Zwinger Dresden Germany This artwork is old enough so that it is in the public domain Photography was permitted in the museum without restriction 2013-12-08 07 47 14 own Daderot other versions PD-old-70 cc-zero Uploaded with UploadWizard Sundials in Mathematisch-Physikalischer Salon Zwinger Dresden Equatorial sundials Johann Gottfried Zimmer Metal sundials |