Warren

=Evangelista Torricelli=

I think these contributions were particularly important because:
The barometer is very useful on ships inportant because it measures the air pressure and knowing that you tell the weather.

The picture included on this page helps to show that:
A barometer, by measuring the air pressure, show the type of weather you might get rain, a storm, very dry and fair. This device is mostly used on boats to tell the weather.