OXALIC ACID AND URANIUM SALTS AS A PHOTOMETER. 303 



Date. 



Sol. 



Time. 



Time. 



Decom- 

 position. 



. Decom- 

 position 

 per hour. 



Remarks. 



February 4, 1910 



U 



U 

 U 



U 



v 



O 



U 

 V 



I" 



' u 

 u 



u 

 u 

 u 



u 

 u 



u 

 u 



9.00- 1.00 



9.00- 4.00 

 9.00-10.00 

 8.30- 2.30 



9.00- 1.00 

 9.00- 1.00 



10.00- 1.00 

 10.00- 1.00 



9.30- 1.30 



8.45- 1.45 



9.00- 1.00 



9.00- 1.00 



9.00-12.00 



9.00-12.00 



9.00- 4.00 



10.40- 2.40 



11.00- 1.00 



11.00- 1.30 



11.00- 1.00 



Hrs. 



4 



7 

 1 

 6 

 4 

 4 



3 



3 



-> 



5 



4 



4 



3 



3 



7 



4 



2 



2.5 



2 



Per cent. 

 64.0 



82. 

 20.0 

 44.0 

 45.0 

 60.0 



66.0 

 57.0 



90.0 

 35.0 

 43.0 

 66.0 

 89.0 

 75.0 

 91.0 

 85.0 

 53.0 

 66.0 

 53.0 



Per cent, 

 16.0 



11.7 

 20.0 

 7.3 

 11.2 

 15.0 



22.0 

 19.0 



22.5 

 7.0 

 10.7 

 16.5 

 29.6 

 25.0 

 13.0 

 21.0 

 26.5 

 26.4 

 26.5 



Sun behind cloud from 

 10 to 11. 



Do. 

 Bright sun. 

 Cloudy dark day. 

 Cloudy day. 

 Cloudy about half the [ 



time. 

 Bright sun. 



Cloudy about one-quar- 

 ter of the time. 

 Bright sun. 

 Cloudy. 



Cloudy most of the time. 

 Bright sun. 



Do. 



Do. 

 Cloudy all day. 

 Sun about half the time. 

 Bright sun. 



Do. ■ 



Do. 



Do ... 



February 5, 1910 



February 7. 1910 



February 8, 1910 . 



February 9, 1910. _ 



' February 14. 1910 



February 16, 1910 



February 17, 1910. . . 



February IS, 1910 



February 21, 1910 



February 22. 1910. __ 



'February 23, 1910 



February 27, 1§10. . . 



February 28, 1910 



MhtcIi 1, 1910 



March 3, 1910 



March 4, 1910 



March 12, 1910 





It will be noted that October 26, January 1. January 17, and February 

 22, may 'be classed as nonactinic days, while October 21, November 19, 

 December 12, and March 3 and 4 may be classed as verv decidedly actinic. 



