Keywords: Horizontal sundial, Johann Willebrand, Augsburg, c. 1720 - Mathematisch-Physikalischer Salon, Dresden - DSC07927.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 06 51 41 own Daderot other versions PD-old-70 cc-zero Sundials in Mathematisch-Physikalischer Salon Zwinger Dresden Uploaded with UploadWizard Johann Willebrand Horizontal sundials Metal sundials |