In the figure we have a circuit of an analog computer published in the Radio Electronics magazine of June 1958. Accuracy depends on the components used, mainly the potentiometers.
We found this circuit, which appears with variations on this site, in a European documentation from the...
This circuit that drives an electromechanical counter of the time was found in Radio Electronics magazine...
Found in a Hands On Electronics of the 80s, this circuit makes use of a gas sensor of the time....