The 1939 Callendar Steam Tables

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THE successful design of improved steam power-cycles utilizing high pressures and temperatures depends entirely on an accurate knowledge of the properties of steam. An increase in the efficiency of the steam cycle by 1 per cent represents a large annual saving in the coal cost for a modern power station; but this degree of accuracy in the calculations can only be attained if the tabulated properties of steam at extended pressures and temperatures are reliable. Practical evidence was obtained of the inaccuracy at high pressures of the earlier steam tables when high-pressure boilers were first constructed, for the calculated heat transferred to steam plus the measured losses in the boiler was greater than the heat supplied by the fuel. Since the losses in a modern boiler are small, and can he measured with a high degree of accuracy, it was clear that the tabulated total heats of steam were greater than the true values. The 1939 Callendar Steam Tables Compiled and edited by G. S. Callendar A. C. Egerton. (Published for the British Electrical and Allied Industries Research Association.) Second edition, with New Appendix on Properties of Compressed Liquid Water. Pp. 70. (London: Edward Arnold and Co., 1944.) 12s. 6d. net.