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A PRECISION APERIODIC THERMOSTAT
1.F. O. Schmitt and O. H. A. Schmitt, Science, 73, p. 289, 1931.
2.Adequate stirring is achieved by the use of a large four‐bladed paddle driven at a speed of 150 r.p.m.
3.Completely quantitative regulation is possible by means of a recent modification of this circuit in which the mercury contact is replaced by an optical system in conjunction with a photocell and in which the Thyratron is replaced by an ordinary 3 element vacuum tube designed for high plate voltage and current. Data concerning the performance of this modification are not yet available.
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