When I was teaching a bit I would take a slide rule into the algebra class and tell then it was a calculator. For Algebra I I showed them how to do multiplication and division. For the Algebra II/trig class they got to see the trig and log scales used and for the pre-calc class they got to see use of the exponential scales. All were amazed at the ingenuity of it!
Nice slide rules are available at decent prices on the ‘Bay. I got a couple just to relearn how to use them. Thing is, unlike calculators, you actually have to be able to think and understand the underlying math to use them successfully. Much too demanding for today’s students.