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Jamaica Weather > Instruments
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WEATHER INSTRUMENTS.
The Kew Pattern Barometer is the standard type of
barometer used to measure atmospheric pressure.
The barometer, the single most important meteorological
instrument, measures atmospheric pressure. The invention of the mercury barometer in 1643 by Evangelista
Torricelli depended on his realization that air has weight. He noted that if the open
end of a glass tube filled with mercury is inverted in a bowl of mercury, the atmospheric pressure on the
bowl of mercury will affect the height of the column of mercury in the glass tube. The greater the air
pressure, the longer is the mercury
column.
The Rainfall Gauge is used to measure the amount of
rainfall over a specified area.
The rain gauge is composed of three parts: a funnel, a measuring tube, and a 4-inch diameter overflow tube. The funnel directs the precipitation into the measuring tube and magnifies it by a factor of 10. This allows observers to report rainfall to the nearest 0.01" (one hundredth of an inch). The measuring tube, when full, will hold "one inch" of rainfall. When it rains more than one inch, the excess water collects in the overflow tube.
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