Aneroid Barometer...

Continuing my treasures from my family series here is my Aneroid Barometer rescued from my maternal Grandmother's home when she passed away, her name was Mildred Joyce Slack nee Travell known as Joy, as you can see our family name is on here, I don't know why! Did they make them? Did they commission this?? This part of my family came from Nottingham.
It doesn't work but I can see that it is another windy cold grey day!