On Wed, 04 Mar 2020 12:41:28 -0800, Christopher Tidy wrote:

Hi folks,

Does anyone here have experience of getting the air out of a mercury
barometer column?
The standard procedure is to turn it upside down, use an eyedropper to
fill the bottom of the tube, and poke a wire down the column to knock any
air bubbles loose. Then, the TRICKY part is to get the tube back right-
side-up without allowing the mercury to escape and air to get back in.

It seems impossible to do this without getting your hands in the mercury.

Jon