CLARK CELL AS A STANDARD OF ELECTROMOTIVE FORCE. 
G17 
Fig. 6. 
With a large stout antimony plate cells of low resistance could easily be made. 
The tests made on this cell are shown in the following table. 
Table XV. 
July 9. 
July 10. 
July 11. 
J uly 20. 
July 21. 
July 22. 
July 30. 
Aug. 6. 
Aug. 17. 
Nov. 14. 
Dec. 16. 
No. 
18° 
18° 
19° 
18°-5 
17° 
16°-6 
17°-2 
11°T 
16°-2 
82 
-32 
-5 
-9 
-3 
— 2 
-3 
-3 
— 5 
-3 
2 
— 2 
83 
-6 
—4 
-4 
-5 
-4 
3 
-3 
Cell 82 was made on July 9th, 1891. 
Cell 83 was made on July 21st, 1891. 
During several of the tests the cells were inverted top to bottom without producing 
any effect. It is clear that at temperatures of 16° to 18° they are rather less than 
the standard, while at 11° they appear to be greater. Thus their temperature 
coefficient is rather greater than that of the usual form. Over the range worked 
with the difference between their E.M.F. and that of the standard is well within 
'1 per cent. 
MDCCCXCII.—A. 4 K 
