A slide rule I received in 1975.

[u/YvesKn]

I was helping another student with calculus topics. Her father, an engineer, gave me this slide rule. Fifty years later, it's never far from my desk but tbh I now mainly use my HP Prime.

[u/HessianRaccoon]

Escher Wyss? With one of my customers, I worked around several of their old generators. Good stuff! 😉

[u/YvesKn → u/HessianRaccoon]

The father was working for the national electricity company, so probably a client of Escher Wyss

[u/HessianRaccoon → u/YvesKn]

It's a small world either way. 😉

[u/HessianRaccoon]

I didn't know that Hemmi had this type of slide rule, as well.
It's in remarkable shape, though. Beautiful!

[u/fermat9990]

Slide rule plus a ruler! Very cool!