Torricellian barometer
Not on view
Hermes, the Greek god of commerce and patron of weights and measures, was known to the Romans as Mercury. His image on this barometer is appropriate for an instrument to measure changes in air pressure. It doubles as an allusion to the column of mercury by which the measurement is made. The glass tube is a modern replacement.
This image cannot be enlarged, viewed at full screen, or downloaded.
This artwork is meant to be viewed from right to left. Scroll left to view more.