Barometer

Barometers were one of the few things I understood in physics.

This is close to an emergency blip, I don't think I have the N-Virus, but have felt off colour enough not to be in proper blip-mode. So sorry for no comments, normal service for sure tomorrow...

In the meantime, I have a brother-in-law whose name is E Torricelli. Not the same E.Torricelli who in 1643 worked out the theory of the barometer. So a drink to him!