A stiff-backed man manipulates the knobs and levers of a "target computor (sic)," designed to help aim large pieces of artillery, in this image from 1922. Bigger version at the link. [Shorpy, thanks Bec!]
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Looks like a smaller version of the targeting computers they used on warships during this era. Of course, these computers are completely analog but did a pretty good job for a overgrown calculating machine.