Today, I saw a very old historical piece of lab equipment at the university. It had a large number of dials, although not as large as you would see in an oscilloscope. The size was similar to an oscilloscope, though, although it isn't as deep due to the lack of a CRT. The text "impedance bridge" was written in the label of the device.
I couldn't find an impedance bridge page in Wikipedia. There is impedance bridging page, but I assume that is for an entirely different purpose.
Loosely related, although I believe the impedance bridge may be distinct from a universal bridge: What is a "universal bridge"?
So, what is this historical piece of equipment that is called "impedance bridge"? Is it different from "universal bridge" (please feel free to mark as duplicate if not)? What does it do? For what purposes is it used? Is an impedance bridge needed in modern times too, or is it just some obsolete historical equipment?
Edit: Ok, sorry for the shaken picture (should have used DSLR instead of a mobile phone camera), but here's it: