- one sold to the Russian Court around 1900
- the second one was on the American market less than ten years ago
- the third one is exhibited at the Musée des Arts et Métiers in Paris, but is a laboratory instrument, without ornament.
The use was simple: the casket contained a resin tray reacting by friction with a cat's skin, creating electricity. The resin tray was linked to the tap of two cristal vases, releasing hydrogen producted by the combination of sulphuric acid inside the upper vase, and zinc pieces inside the lower vase.
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