PREFACE. 



THE Tables of the I'rojK nies of Steam were calculated twenty yean 

 ago to accompany the author' Thermodynamics of the Steam Kngine; 

 ih.it timr important experimental investigations have been made 

 by Callendar, Barnes, Knoblauch and Thomas. The tables have 

 recomputed, introducing this information and with certain -Kflfff 

 whit h will be found to fa iu-ir use. All the tablet for saturated 



team have columns of entropy due to vaporization; and the tat 

 rm : ru units has been made into a conversion table by aid of which proper- 

 ties can be found in either metric or English units or a combination of 

 the two systems may be used. 



development of the steam-turbine has given prominence to adia- 

 to m put at ions for steam and has emphasized the facts that the 

 usual methods are tedious and cannot be worked inversely. To meet 

 ilty various diagrams have been devised, all of which have 

 certain inconveniences; if they have a convenient scale, they are so large 

 as to be awkward to carry or to use; all have important problems repre- 

 sented by curves which render interpolation troublesome. 



To facilitate the solution of all adiabatic problems (and many others) 

 a Temperature- Km ropy Table has been constructed for saturated and 

 superheated steam. For engineering purposes the answers for such 

 problems may be read directly from the table; greater refinement can be 

 had by interpolation when that is thought desirable. That part of the 

 table which refers to saturated steam may be relied upon to give the 

 nearest unit in the last place of significant figures; the degree of accuracy 

 to be attributed to tin -rural properties of saturated steam can be 

 rnined from the statements of experimental data and derivation of 

 formula? given in the Introduction. The properties of superheated 

 i arc given with as much accuracy as conditions warrant. This 

 part of the table offers solutions of problems that cannot be readily 

 obtained otherwise. 



Original data are given in the Introduction so far as possible, and 

 computations and transformations of equations arc set down at length 



