MAUMENE FIGURE. 337 



The results calculated for 100 per cent, acid were obtained by 

 the following formula : — 



21'5 



Rise of temp, x , .-■- „.. =77-= = rise of temp, with 100 



per cent, H,S,0, - 78-5 p^^ cent. a^id. 



Richmond Modification. — The author calculates the "Rela- 

 tive Molecular Maumene " figure by the following formula : — 



R.M.M. =R> 



where R = observed rise of temperature, 



a; = percentage of H2SO4 in acid. 

 h = heat capacity of apparatus. 

 K = potash absorption (per cent. ). 



25 grammes of oil were used and 5 c.c. of acid. 



The method is performed as follows : — A beaker about l.l inches 

 in diameter and 3 inches deep is fitted, by means of a ring of 

 cork, inside a slightly larger beaker ; this is placed in a third 

 still larger beaker, and the intermediate space packed with 

 cotton wool. The heat capacity of this apparatus is next deter- 

 mined ; about 10 grammes of water are placed in the innermost 

 beaker and the temperature noted ; about 2.5 grammes of wati'r 

 ■of higher temperature are added, and tln' final temperature 

 noted. The heat equivalent of the apparatus is calculated by 

 the formula — 



c-a 

 where h = heat capacity of apparatus. 



j: = weight of water placed in beaker. 



y = weight of hot water added. 



a = temperature of apparatus. 



6 = temperature of hot water. 



c = final temperature after mixing. 



The folloning experiments will show the nature of the value 

 of h :— 



y- 



h. 



Kiiimmes. grammes. grammes. 



10-0 16-0° 26-5 39-0° 31-2^ 3-60 



10-0 17o^ 23-5 50-5" SS-S" 3-43 



0-0 200° 35-1 42-0° 400° 3-51 



When the innermost beaker holds about double the volume of 

 the oil and acid, its weight multiplied by 015 will give its heat 

 capacity with considerable accuracy; the beaker used above 

 weighed 23 2 grammes ; this multiplied by 015 gives 3 ■18. 



Twenty-five grammes of filtered and dried fat are weighed 

 into the beaker, and the apparatus with thermometer, together 



