Old Tech Find – Unigraph Barometer

A truly great find on Gumtree this evening, a “Unigraph” desktop barometer from the 1930s. I just had to have this cool-looking thing as soon as I saw the ad, I drove round and picked it up straightaway, £10.

Up top it has a Fahrenheit temperature display, with a manual date indicator on the right of the (deco style?) stand, but it’s the barometer display that really attracted me. Instead of having a needle that meanders from Fair to Stormy this thing has what appears to be a decorated paper drum inside, that rotates to display a weather scene matching the current barometric pressure. An amazing data visualisation for the time!

The only slight problem is – it seems to be working perfectly. Both the temperature and pressure drums are wiggling fairly freely. I had great visions of keeping the visuals the same and recreating the mechanism with servos and weather API calls, illuminating the case from the inside and swapping the ratty date cards for an e-ink display!

I’ll have to keep an eye on it over the coming days as it gets used to the rarefied climate in my office. If it doesn’t change with the weather – well it’s coming apart.