170 THOMSON ON CARNOT'S 



extreme limits of his observations, the latent heat 

 of a unit weight of saturated steam. 



EXPLANATION OF TABLE I. 



37. The mean values of jn for the first, for the 

 eleventh, for the twenty-first, and so on, up to the 

 231st* degree of the air-thermometer, have been 

 calculated in the manner explained in the preced- 

 ing paragraphs. These, and interpolated results, 

 which must agree with what would have been ob- 

 tained, by direct calculation from Regnault's data, 

 to three significant places of figures (and even for 

 the temperatures between and 100, the experi- 

 mental data do not justify us in relying on any of 

 the results to a greater degree of accuracy), are 

 exhibited in Table I. 



To find the amount of mechanical effect due to a 

 unit of heat, descending from a body at a temper- 

 ature 8 to a body at T, if these numbers be in- 

 tegers, we have merely to add the values of ja in 

 Table I. corresponding to the successive numbers. 



T+\, T+2, ....#- 2, S-l. 



* In strictness, the 230th is the last degree for which the 

 experimental data are complete ; but the data for the 231st 

 may readily be assumed in a sufficiently satisfactory 

 manner. 



