Today a friend and I explored the Ceramics Building basement here at the University of Illinois at Urbana-Champaign, and found a room containing a bunch of test equipment and assorted other things (film projectors, a 1970s thermal camera,...). Among those things were some HP devices, which I took pictures of.
Before they were a huge manufacturer of printers and computers, they made the world's best scientific programmable calculators - but before that, in the 1940s, HP made their name making electronics test equipment, such as the devices here.
Though these pictures were taken on my potato-quality phone camera, hopefully you enjoy them!
