Today, only a few pocket watches still exist by Johann Heinrich Seyffert, who was one of the pioneers of precision clock-making. One of these is in the Royal Cabinet of Mathematical and Physical Instruments in Dresden. However, the watch was so badly damaged in the Allied bomb strikes on Dresden in 1945 that it can no longer be opened. How is it possible to still examine this timepiece that is over 200 years old? Thanks to tomography, historian Dr. Sibylle Gluch is able to look inside the watch. The scan allows the watch movements to be examined millimetre by millimetre, and is intended to provide information on the parts used and the underlying technology. How did Seyffert work? What developments can be traced in his work and that of his successors Johann Gutkaes and Ferdinand Lange?
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