Tempest prognosticator (nonfiction)

The 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.

Fiction cross-reference

• Gnomon algorithm
• Gnomon Chronicles

Nonfiction cross-reference

• Storm glass (nonfiction)

External links:

• Tempest prognosticator (nonfiction) @ Wikipedia