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History
This fascinating
weather instrument provides a reading of the current weather conditions
using several scientific methods established hundreds of years
ago.
The Thermometer portion of the instrument works based on a "Natural
Law of Physics", discovered by Galileo Galilei ( 1564-1642).
It was Galileo, "the Father of Modern Physics", who
established the principle that the density of the liquid changes
with the temperature. Our thermometer is a replica based on Galileo's
experiments. When the temperature rises, the liquid in the glass
cylinder become less dense and the spheres sink slowly, one by
one. Conversely, the spheres will rise as the temperature decreases.
The lowest floating sphere in the upper portion of the cylinder
indicates the correct temperature.
The side mounted "Barometer Tube" or "Water Barometer"
dates back to early 17th century Europe. A time when farmers and
mariners relied on instruments such as this to predict changes
in the weather. Falling fluid indicates chance of fair weather.
The
Hygrometer measures humidity.
How
it Works
Thermometer
The colored floating spheres are "pushed" either up
or down depending on the changing density of the clear fluid inside
the glass thermometer body. When the thermometer goes up, the
clear fluid becomes less dense and rises - forcing the (heavier)
sphere down one by one. When the temperature goes down, the clear
fluid becomes denser - forcing the (lighter) spheres upward.
Barometer
While not as accurate as modern day aneroid barometers, the principle
of the early "Water Barometer" is sound. When atmospheric
pressure decreases, the fluid is pulled upward toward the top
of the barometer tube (low pressure). As atmospheric pressure
increases , the fluid is "pushed down" (high pressure).
Standard atmospheric pressure at sea level is 29.92"
Hygrometer
The Hygrometer Gauge measures % of relative humidity in the air.
Humidity is determined by reading the number at the end of the
indicator pointer.
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