Zambretti Forecaster

The Zambretti Forecaster is a weather forecasting instrument used in conjunction with a barometer. It interprets the reading of a barometer into one forecast from a large selection of permutations after making allowances for variable factors. These include wind direction, a rising, falling or steady barometer, and the season. ...
Found on http://en.wikipedia.org/wiki/Zambretti_Forecaster
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