64 
PHYSICS: ROSA AND VINAL 
107.88 grams, is 96,494 coulombs, which is the value of the Faraday. 
For general use the value 96,500 coulombs is a convenient round num- 
ber which is within the experimental error. 
Although some phenomena of the voltameter are not yet perfectly 
understood, the recent researches have shown how to use it as a reliable 
current standard and as a means of checking the constancy of the value 
of the Weston normal cell. The experiments made at the Bureau of 
Standards during the past eight years have been fully described in a 
series of papers which have appeared in the Bulletin of the Bureau. 
