Keywords: Horizontal sundial (Butterfield dial), Charles Francois Langlois, Paris, c. 1725 - Mathematisch-Physikalischer Salon, Dresden - DSC07923.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 50 50 own Daderot other versions PD-old-70 cc-zero Sundials in Mathematisch-Physikalischer Salon Zwinger Dresden Uploaded with UploadWizard Charles François Langlois Folding sundials |