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Experimental Details for a Precision High Temperature Control Utilizing the Hull Circuit
1.Submitted in partial fulfillment for the degree of Master of Science, Polytechnic Institute of Brooklyn.
2.A. W. Hull, Gen. Elec. Rev. 32, 394 (1933).
3.Zabel and Hancox, Rev. Sci. Inst. 5, 28 (1934).
4.A thermocouple may be used instead of a platinum resistance thermometer. However, the authors found it difficult to keep the potentiometer balanced against the standard cell over long periods of time when using the former.
5.It is important that the galvanometer light should move off the photo‐cell whenever the furnace temperature rises above the desired equilibrium temperature. In this way the furnace windings, etc., are automatically protected in the event that the galvanometer light should burn out.
6.With these high ratios of the Wheatstone bridge arms, there is a tendency to draw large currents from the bridge battery. Care should be taken to maintain this current low enough so as to insure reasonable voltage stability and battery life.
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