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The use of thermostatic bimetals has increased rapidly during the last fifteen years. In this period, considerable study has been given the subject. The present paper reviews the available information dealing with the theory and practice in the application of bimetals. A lack of essential data concerning various pertinent properties of the material is indicated. Basic principles are thoroughly considered, as in the analysis of the mechanics by Professor Timoshenko and in the properties of nickel-iron alloys. However, a considerable fund of useful data is also presented in the form of curves and tables which give the properties of representative bimetals.