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Tempest prognosticator
The tempest prognosticator, also known as the leech barometer, is a 19th-century invention by George Merryweather in which leeches are used in a barometer. The twelve leeches are kept in small bottles inside the device; when they become agitated by an approaching storm they attempt to climb out of the bottles and trigger a small hammer which strikes a bell. The likelihood of a storm is indicated by the number of times the bell is struck.
==Invention and development==
Dr. Merryweather, honorary curator of the Whitby Literary and Philosophical Society's Museum, detailed the sensitivity that medicinal leeches displayed in reaction to electrical conditions in the atmosphere. He was inspired by two lines from Edward Jenner's poem ''Signs of Rain'': "The leech disturbed is newly risen; Quite to the summit of his prison."〔The Weekly Dispatch. 22 March 1851. "(London: The Great Exhibition )". Accessed 22 January 2007.〕 Merryweather spent much of 1850 developing his ideas and came up with six designs for what he originally referred to as "An Atmospheric Electromagnetic Telegraph, conducted by Animal Instinct." These ranged from a cheap version, which he envisaged would be used by the government and the shipping industries, to a more expensive design. The expensive design, which took inspiration from the architecture of Indian temples, was made by local craftsmen and shown in the 1851 Great Exhibition at The Crystal Palace in London.〔Packer, Martin. The Victorian Web. "(Dr. George Merryweather’s 1851 Tempest Prognosticator )." Accessed 22 January 2007.〕
On 27 February 1851 he gave a nearly three-hour essay to members of the Philosophical Society entitled "Essay explanatory of the Tempest Prognosticator in the building of the Great Exhibition for the Works of Industry of All Nations."〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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