MGM Tom & Jerry cartoon "Designs On Jerry" (1953), included on the
videotape collection "Tom & Jerry On Parade" from Turner Home Video.

"Build a BETTER MOUSETRAP and the world will beat a path to your door."

In his attic, Tom is finishing his new mousetrap design. Around him
are classic instruments of engineering: a large drafting table with
his blueprint design, scales, compass, a nice heavy black pull-lever
adding machine and... A slide rule! He even uses it (and the adding
machine) to complete a quick calculation for a detail on his drawing.

It looks like a ten-inch rule, clearly a duplex with a thick white
body, must be a laminated wood or plastic rule. The simple cursor
has rounded white indicator bars. Maybe a Dietzgen 1725?