Theories of Walter Wuest; Alfred Wolf; Clark, Gilroy, and Reissner; and the author are compared. Results are presented in curves plotting the same dimensionless ratios in all cases. These curves are useful in designing Bourdon tubes of flat-oval, elliptical, or pointed-arc cross section. Experimental data are compared with a curve based on the author’s simplified theory, and an empirical curve of similar shape is drawn. Results of analyses of tip travel and tip force are given. A start is made on the project of the ASME Research Committee on Mechanical Pressure Elements to change Bourdon-tube designing from an art to a science.

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