248 Scientific Proceedings^ Royal Dublin Society. 



The following rates of evaporation have been obtained witli revolving bulb 

 evaporators of different types : — 



Bulb with one end open to air (type C) ... -142 c.c. per sq. cm. per minute. 



Bulb with one end open to air, with air-jet ... -237 „ „ „ „ 



Bulb with centrifugal cross-arm (type A) ... -170 ,, „ „ „ 



The rates of evaporation are calculated on the area of the water surface when 

 at rest. 



Chemical Laboratory, 



collegk of science, dubi-in. 



