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If you zoom in this image, to the leftmost, white "cell" in the middle "row" of the machine, it says, in the bottom, "INT NET": https://upload.wikimedia.org/wikipedia/commons/c/c6/PACE-TR-10_analog_computer_-_National_Cryptologic_Museum_-_DSC07908.JPG

Does this in any way have something to do with Internet or any other kind of network? In the Wikipedia article, it says is was the first desktop computer, used by NSA.

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    There's no such thing as a stupid question.
    – Mark Williams
    Mar 7, 2020 at 11:39
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    A pure analogue computer with internet access would be interesting -- TCP/IP done entirely in (non-digital) circuitry!
    – another-dave
    Mar 7, 2020 at 13:45
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    Considering the term "internet" wasn't invented until December, 1974, I find that highly doubtful.
    – Jörg W Mittag
    Mar 7, 2020 at 16:55
  • @MarkWilliams True, but there are such things as a non-researched question, for which there is a downvote button.
    – pipe
    Mar 8, 2020 at 0:57
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    @another-dave -- you can do TCP/IP without any circuitry, see e.g. RFC1149 (tools.ietf.org/html/rfc1149)
    – Michael Graf
    Mar 8, 2020 at 22:18

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No, this has nothing to do with any networks; the "INT" stands for "integrator." That panel and the adjacent one to the right are the interface to an integrator/memory module:

Integrator/memory module

Integrators in analogue computers are used to measure quantity over time, basically a sort of sum function.

You can find more pictures of the modules on The Analog Computer Museum's EAI TR-10 page; they also have a brochure (PDF) that gives a much more detailed description of the system.

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    Looking at p. 8 of the brochure, this is not a complete integrator, but only a (dual) integrator network; hence the "INT NET" label. To create an integrator, it needs to be connected to an operational amplifier, which at the time meant another module of the same size.
    – Michael Graf
    Mar 8, 2020 at 22:16

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