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Excerpt from The Properties of Saturated and Superheated Ammonia Vapor
The first attempt to establish the fundamental equations for the vapor (ff ammonia and to compute tables of its properties was made by Ledoux.6 These equations and resulting tables, resting as they do upon unsound hypotheses and meager experimental data, are, in the light of later investigations, quite inaccurate. The next theoretical investigation of the subject was undertaken by Zeuner,7 who computed new constants for ammonia, in the equation of state of the form already applied by him to steam, and used by Ledoux for ammonia. He also constructed empirical formulas for the inner and outer latent heat, and the specific heat'of the liquid, and by use of these formulas computed tables which. Appeared in the earlier editions of his thermodynamics.8 In the later editions9 the values thus calculated have still been used for temperatures below 32° F., but results of later experimental deter minations have been used above that temperature. These tables for ammonia vapor are given in both English and French units.
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