Uploaded November 2017 | Updated September 2026, 2 weeks ago

---

Here is a look at a 1920s model E-3040 Queen Potentiometer from Gray Instruments. Classic wood and brass lab gear here, used for setting up bridges, back when things like digital multimeters did not exist!

Check out Max's channel:

youtube.com/channel/UCLsp71mRNqoRSi6YC0jLmFA