This is the receiving station for the letter-printing telegraph described here. This is a lot more complex than the transmitter, so we’ll break it into stages. This first stage is responsible for converting the electrical signal back into a mechanical signal. Here is the pic from the patent.
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This is an example of one of the first letter-printing telegraphic devices where the sending operator press alphabetically labeled keys and the receiver unit printed the letters on a strip of paper. The patent was filed sometime in the late 1830s and granted in 1846. At the time, electric components were pretty much limited to electromagnets and batteries. Thus, most of the operation of the apparatus is achieved through clock-work mechanical means. I’ll go through the patent starting from the sending station, but the magic all happened at the receiver.
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