MAHLER'S CALORIMETER. 



Difference of gross temperature , . 3. 140 



Correction (4, 5) (5, 6) 0.016 X 2 0.032 



(4, 3i) 0-005 



(3 3i o.ooo 



Corrected difference of temperature 3. 177 



or 3.18. 



Calories. 



Heat disengaged 3.18. 3.18 X 2.681 = 8.5256 



Iron wire 0.025. 0.025X1.6 =0.04 



Nitric acid 0.15. 0.15 X 0.23 =0.0345 



0.0745 



For one gram 8.45 1 1 



or 8451.1 for I kilogram, equivalent to 15212 B. T. U. 



EXAMINATION OF A GAS. 



Illuminating' gas was examined under the following con- 

 ditions:* 



Barometric pressure 761 mm. (29.6 inches). 



Tension of aqueous vapor 8 " (0.314 inch). 



Temperature of laboratory 18.5 C. (65.3 F.). 



Volume of bomb 654 f cc. (39.9 cubic inches). 



dry at o and 760 mm. 



606 cc. (37 cubic inches). 



The capsule was left in its usual place in the bomb to pre- 

 vent specks of iron oxide from dropping on the enamel and 

 injuring it. 



* See Kroeker's calorimeter on page 73. 

 f Exaciiy 653.9 cubic centimetres. 



