Left: Evaluating a function of one variable with a rotary cam.
Left: Evaluating a function of two variables x and y with a 3D rotary cam.
Left: One method of mechanical multiplication
Left: A Dreyer Fire Control deflection totaliser: 1906.
Left: A US Army Air Corps astro-navigation computer from 1938.
This unit was carried by Howard Hughes on a round-the-world seaplane flight. Photo from Popular Mechanics, Oct 1938
Left: The internals of the US astro-nav computer. I'm afraid I know nothing about its internal operation.