Fareow. — Depression of Ficeziiif/-po/Nf of Wafer 



31 



Freezing-point No. 2, Series A. 

 The freezing-tube surrounded with ice, and stirred under a slight excess 

 of pressure for 15 minutes. Pressure then released by opening H. Gas 

 given oft" from the water showing solution to be saturated. Stirring con- 

 tinued for 10 minutes, when rise of manometer no longer evident, and 

 then cooling-bath brought under. Thermometer-readings every 15 seconds. 

 Stirrer in motion throughout. 



* Freezing began at this point by formation of ice in flakes. 



t After 3 minutes' stirring the temperature was again read. Two successive readings 

 ■of 0-639 were obtained. 



Atmospheric pressure . . 

 COg pressure . . 



Total 



Atmospheric temperature 



Pressure corrected for room-temperature 



Freezing-point 



Correction of thermometer for pressure 



Corrected freezing-point 



Thermometer zero 



Depression in degrees Beckmann 



Depression in degrees Cent. 



Depression calculated . . 



763 mm. 

 411 mm. 



1174 mm. 



10° C. 

 1172 mm. 

 0-639 

 0-222 

 0-417 

 0-586 

 0-169 

 0-156 

 0-142 



Series B, with New Thermometer (19 Experiments). 



This thermometer being rather short, the top of bulb came within 5 mm. 

 ■of the lower plane of the stirrer-solenoid, while the water of the freezing- 

 tube came up to this plane and was subject to some heating from the coil. 

 The freezing-points were, in consequence, less definite than in Series A, 

 the heating due to the stirrer-coil keeping the upper part of water always 

 free from ice, and the temperature always showing a tendency to creep up. 



Nineteen experiments were made, with total pressure raiigin^from 

 3277 mm. to 1432 mm. of mercury. , - '' ' "■ f'^\ 







