PopSci travels to Paris's Conservatoire National des Arts et Métiers to round up the scientific instruments and machines of the 18th and 19th centuries.
Believe this had something to do with generating electricity.
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frenchgadg_tele.jpg
Some kind of early telegraph . . . I think the guy cranking one handle could Morse-code the dude cranking the other. Mostly they'd talk about what that dome on the top is for.