File:Spherical burning mirror, Ehrenfried Walther von Tschirnhaus, Kieslingswalde (today Slawonice, Poland), 1786, copper - Mathematisch-Physikalischer Salon, Dresden - DSC08142.JPG
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English: 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.
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