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Most of these types of devices used nickel-chromium wire wound on ceramic forms.

A known precision resistance allowed one part of the equation to be selected and the remainder was then calculated.The end result is the desired resistance at the large binding posts.Also, one could calibrate a device by using the box and moving the shunt pins around for the desired result and then total up the shunted R value and subtract that from the total R (1100 ohms for this box) and that would give the calibration resistance necessary to achieve the result desired. However, it shows the process necessary before "dial in" decade boxes were available.Also, these types of rheostats were available in many different values of total resistance and maximum current flow ratings.This JAGABI has a screw-thread drive within the square tubing to allow minute adjustment of the slide contact position.

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