On the wall were a compass indicating the ship's heading and a mercury barometer.
The first set of experiments relates to determining air pressure with mercury barometers.
Torricelli's chief invention was the mercury barometer, which arose from solving a practical problem.
A mercury barometer is one of the classic uses of static pressure head.
Building upon Galileo's notes, he built the first mercury barometer and wrote a convincing argument that the space at the top was a vacuum.
Torricelli attracted considerable attention when he demonstrated the first mercury barometer to the general public.
Moreover, it is very much the question whether the ban on mercury barometers would be an effective measure.
Also, as mercury barometers do not require any batteries, they have an unlimited life span.
The mercury barometer stood lower the higher one went.
On the wall to my right were the instruments for measuring atmospheric pressure - a barograph and two mercury barometers.