Determination of e, N, and Related Constants. 5 



pressure, heldi absolutely constant during an experiment, 

 was varied from 13 cm. to 76 cm. and was measured to a 

 tenth mm. by the manometer m. The atomizer, A, fed 

 from s with the highest grade of watch-oil, density at 23° C. 







1 





^ 



X 







1 













CO 



-e 



,— Ji|i|i|l en..- |j|,|l 



"-o q 



5 £ 



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redetermined as '9199, was blown with carefully dried and 

 cleaned air, let in through the cock r, the bulbs below A being 

 to catch excess oil. The observing optical system was a 

 specially constructed telescope of 30 mm. objective and 

 a magnification of 25 diameters. The objective was about 



