HEAT PRODUCTION BY EGGS. 345 



conduction coefficients from cooling curves for large intervals, 

 since Newton's law of cooling applies to small and constant 

 temperature differences, i.e., equilibrium conditions. This re- 

 quirement could not be met since there was not available any 

 current measuring device of sufficient accuracy to allow the use 

 of electrical heating. It was necessary therefore, to get the 

 cooling corrections under the actual experimental conditions. 

 Following White (9) 



Let 61 = temperature of flask (i), 

 8 2 = temperature of flask (2), 

 6 3 = temperature of external bath. 



The temperature coefficient of conduction for the flask is defined 

 as the temperature change between the inside and the outside 

 of the flask in unit time when the temperature difference between 

 the inside and the outside is unity. This may be written in 

 mathematical form for flask (I.), KI = ; and for flask (II.), K 2 = . 



0i - 03 dl 



' ^T^ ' ~dt 



Similarly, for the heat conduction between the flasks along the 

 thermopile, 



0i 02 dt 



' 0^^07 ~dt 



Also let wi and w 2 equal the temperature changes due to stirring 

 and evaporation. Then considering temperature changes where 

 there is no liberation of heat in either flask 



dt 



= (Ki + ki + 2 ) (0i - - 2 ) + (Ki - - K 2 )(d 2 -- 3 ) 



01 - - 2 is proportional to fl , the e.m.f. of the main thermopile, 



2 03 is proportional to 0&, the e.m.f. of the auxiliary thermopile. 



