Our archives includes equipment and apparatuses that have been used in courses to help students learn. One of our favorite items is a giant slide rule. Slide rules were frequently used for science and engineering equations up until schools began using the scientific calculator around 1974.
Here's a picture from 1943 where students are using the slide rule to solve a problem.
Here's the same slide rule used by our library students employees today.
Thanks Dylan Havemeyer, Julian Christiansen, and Ayushman Rai for posing for this picture.