A description is given of an automatic furnace control, using a potentiometer bridge and a commercial photocell relay unit, which keeps the furnace temperature to within ± 1° C, when a chromel-alumel thermocouple is used, and in addition controls the run up to final temperature at any given uniform rate of heating within the limits of performance of the furnace winding. The apparatus can be constructed from standard components. A circuit is described by means of which several furnaces can be used simultaneously, being controlled by the same photocell unit.
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Hirst et al. (1943) studied this question.