it was first exhibited at the 1851 london exhibition.1851 lono it was graded by a man with another greatame, a name perfect for meteorology, doctor george meriwether. doctor meriwether who was a surgeon had come to decide or perhaps imagine that when there was an approaching storm, freshwater leeches seemed to get a little agitated, so he thought how can i harness this meteorology wise and what he does was built a device called the tempest prognosticator, which is the very device you ser before you. befor there is this circle of little jars into which a freshwater leech would be placed in each one. the jars would be connected a little wires to bells purely similar to the self mummified monks, i think about it, but the idea was that once a storm wasas approaching these leeches would shimmy and the little ropes with jingle and the belts would ringg and you would think i better take the washing in. [laughter] >> it did not so much work, which is why we have thermometers and barometers instead of tempest prognosticator's, which is a bit sad because look at this thing, but there is still a mo