the Elements Carbon, Boron, and Silicon. 



181 



considerable injury might be done to the costly cut diamonds. 

 Professor Tschermack, Director of the Imperial Mineral Cabinet 

 in Vienna, had the extreme goodness to allow me to make use of 

 seven colourless transparent diamonds (slightly sparkling crys- 

 tals, rounded pieces, and angular fragments). 



In the following Tables the meanings of the letters are as 

 follows : — 



G = weight of substance employed. 



Q = water-value of the calorimeter (inclusive of stirrer and 



thermometer). 

 At = increase of temperature (corrected) which the calorimeter 



showed after the addition of the glowing substance. 

 W = the product of Q into At. 

 AT = the difference between the initial temperature T of the 

 substance brought into the calorimeter and the final 

 temperature T of the same substance (calculated from 

 W and the known specific heat of platinum). 

 C To _ T = the average specific heat for the temperature-interval 

 T-T . 



b. Eocperiments at High Temperatures carried out by means of the 

 double Calorimeter, 



Tenth Series. 





G. 



Q. 



At. 



W. 



AT. 



Ct -t. 



T . 



Platinum... 

 Diamond... 



Platinum... 

 Diamond... 



32-390 

 3-802 



32-390 

 3-802 



103-61 1 5-465 

 105-20. 5-569 



101-21 5-378 

 102-30 5-471 



566-2 

 580-3 



544-2 

 559-8 



506-2 



487-5 



003454 

 0-3016 



003446 

 0-3021 



22-25 

 22-34 



22-63 

 22-71 



From the first experiments ... W 22 . 3 =152-6. 

 From the second experiments W 22 ?^ 2 = 147"2. 



Eleventh Series. 



Platinum... 

 Diamond... 



Platinum... 

 Diamond... 



32-390 

 3-802 



32-390 

 3-790 



154-30' 5-030 

 165-40 5-270 



148-20, 5-105 

 162 85] 5-223 



7761 

 872-9 



7566 

 850-5 



679-8 

 6640 



003524 

 0-3374 



0-03518 

 0-3380 



2204 

 2216 



22-42 

 22-50 



From the first experiments ... W?° 2 2 ° =229-6. 

 From the second experiments W 22 . 5 =224-4. 



