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<p>The temperature-entropy diagram is much inferior to the Mollier diagram for the quantitative solution of problems in steam-turbine design. Willard Gibbs suggested using a surface with entropy, pressure, and total heat as co-ordinates; the Mollier diagram is a projection of this surface on the pressure plane, and thus has entropy and total heat as co-ordinates. The total energy equation for steady motion of a liquid is given, and the conception of total heat, which is sensibly equal to Regnault's "total heat", is discussed. The significance of adiabatic and dissipative How in steam-turbine work is indicated, and the necessity in this work of a clear distinction between adiabatic and%2
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<br>Subjects: steam engines/ B8230E Steam power stations and plants</div>
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