538 Account of Experiments 



have been found by experiment to contain different 

 quantities of absolute heat, or, in other words, to re- 

 quire different quantities of heat to heat equal quan- 

 tities or weights of them to any given temperature, or 

 any given number of degrees, — it will be necessary to 

 determine how much of each of these ingredients is 

 employed in forming any given quantity of dough. 



Now, in the foregoing experiments, as 1 102 loaves of 

 bread were formed of 1736 lbs. of rye-meal, it appears 

 that there must have been 1 1^^ lb. of the meal in each 

 loaf ; and, as these loaves weighed 2\ lbs. each when 

 they were put into the oven, each of them must, in a 

 state of dough, have been composed of i^g^ lb. of rye- 

 meal and lyfo lb. of water. 



Supposing these loaves to have been at the tempera- 

 ture of 55° of Fahrenheit's thermometer when they 

 were put into the oven, the heat necessary to heat one 

 of them to the temperature of 2 1 2°, or the point of boil- 

 ing water, may be thus computed. 



By an experiment, of which I intend hereafter to give 

 an account to the public, I found that 20 lbs. of ice-cold 

 water might be made to boil with the heat generated 

 in the combustion of i lb. of dry pine-wood, such as 

 was used in baking the bread in the six experiments 

 before mentioned. Now, if 20 lbs. of water may be 

 heated 180 degrees (namely, from 32° to 212°) by the 

 heat generated in the combustion of i lb. of wood, 

 iioir lb. of water may be heated 157 degrees (from 

 55°, or temperate, to 212°) with ifofsu of a- pound of 

 the wood. 



Suppose now that the rye-meal contained the same 

 quantity of absolute heat as water, — as the quantity of 

 meal in each loaf was i iVo lb., it appears that this quan- 



