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What type of component is an "adjustable resistor"? Looking the term up online only shows potentiometers, which I really don't think is what is being described here. Is this some sort of memristor?

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It is in fact just a digital potentiometer. In the experiment shown in the paper I linked we’re using a 128 position one. In new work we’ve actually shifted to using transistors which are better for a number of reasons (smaller, faster, nonlinear, continuous).

The Mark I perceptron used physical (analog) potentiometers that could rotate themselves.

Fascinating! You can get digital pots in lots of different configurations.

https://www.digikey.com/en/products/detail/microchip-technol...

https://en.wikipedia.org/wiki/Perceptron

https://americanhistory.si.edu/collections/search/object/nma...

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