Victorian Tempest Prognosticator

There exists a Victorian leech-powered machine which was invented to predict the weather. The Tempest Prognosticator was made up of 12 glass bottles filled with water, each with a live leech inside. The inventor referred to the leeches as his "jury of philosophical councillors" and if they climbed up the bottles and out of the water, a bell would ring to signal that a storm was coming.