18S1.] o69 rCbase. 



92. Latent Heat of Steam. 



The maintenance of the primitive velocity of undulation is exemplifled 



in the relation between the projectile energy of evaporation and the energy 



t: g r 

 of solar rotation. The equatorial velocity of solar rotation is — ^— . The 



mean rotating velocity of the locus of the centre of gravity of Sun and 



Jupiter is, therefore, v^ = - " ° ° . The centre of gravity itself does not 



rotate, but its action produces sethereal photodynamic undulations, which 

 are propagated with the velocity « , which is equivalent to the projectile ve- 

 locity of evaporation, v^ ; 



V = 11 . 



P 8 



This equation is so important that it may be well to give the calculation 

 in full : 

 m„ -- ms = (2 X 3 X 4)* =: 331776 5.5208450 



1 year = 31558149 seconds = t^ 7.4991115 



= 2 TT \-^^^^:-^-~'~- ^ 5073. 6 seconds 3. 7053158 



= 3962 .8 miles 

 (73 = 32.088l"eetr' 



-pz- 





= n„~r.=i'±^-\ =23414.2 4.3694788 



p^=vr^ = 92,785,700 miles 7.9674810 



v^ =v^— ps-r- 497.827 = 186381.4 miles 5.2704025 



p^ = 1.015866 .0068364 



_p„ =^3* = 1.06499 .0273455 



p.^ = ijpjn, ^ m-J r„ = 1.06499 X 1047.879 r, = 1115.98 r„ 3.0476566 



n = ^5 ^5.202796r„ = 214.496 2.3314197 



r^ = p^^n = 432574.9 miles 5.6360613 



Vg^^ = 2 -7t^ r^~ti = 270.557 miles 3.4322592 



.' .V =tzv = 1.31405 miles .1186113 



p s 



From this equation the latent heat of steam, (), can be readily found, by 

 the equations 



^ = VWJh 



7^ 



^ — 1389.6 

 Solving these equations we get 



h = 142.064 miles = 750098 feet 5.8751178 



(9^ 5390.794 C 2.7322280 



The following values of d have been deduced experimentally : 



Favre and Silbermann 535°. 77 



Andrews 535°. 90 



Kegnault 536°. 67 



Tyndall 537°. 20 



Despretz 540°. 00 



Dulong 5430.00 



