402 M. Rudberg on the Dispersion of Light. 



The comparison of the observed with the calculated lengths 

 is shown in the following tables : 



(Schumacher, Astronom. Ahhandl. 1823. p. 31.) 



Flint-glass. No. 13. 

 L = l-OM.Z^''^- 



Observed 

 leni^ths. 

 C 0-00001486 

 D 0-00001330 

 E 0-00001 184- 

 F 0-00001088 

 G 0-00000955 

 H 0-00000876 



Calculated 

 lengths. 



0-00001328 

 0-00001181 

 0-00001084 

 0-00000953 



Flint-slass. No. 23. 



L = 1-040./ 



1 -0496. 



Calculated 

 lengths. 



0-00001328 

 0-00001181 

 0-00001085 

 0-00000954 



Observed 



lengths. 

 C 0-00001487 

 D 0-00001331 

 E 0-00001185 

 F 0-00001089 

 G 0-00000956 

 HO-00000876 



Flint-glass. No. 3. 



L= 1-00218.Z'""446- 



Observed Calculated 



lengths. lengths. 



C 0-00001510 



D 0-00001 352 0-00001350 



E 0-00001204 0-00001201 



F 0-00001107 0-00001104 



G 0-00000973 0-00000971 



HO-00000892 



Flint-glass. No. 30, 

 L = 1-0356.Z*'^49. 



Observed 

 lengths. 

 C 0-00001490 

 DO-00001334 

 E 0-00001 187 

 F 0-00001091 

 G 0-00000958 

 H 0-00000878 



Calculated 

 lengths. 



0-00001331 

 0-00001184 

 0-00001088 

 0-00000956 



Crown-glass. No. 9. 



L = 0-87045./^-°''7- 

 Observed Calculated 



lengths. 

 C 0-00001587 

 D 0-00001422 

 E 00001268 

 F 0-00001168 

 G 0-00001029 

 H 0-00000946 



Oil of Turpentine. 



L = 0-93479./^-°'^9- 



Observed 

 leni;ths. 

 C 0-00001646 

 DO-00001476 

 E 0-00001315 

 F 0-00001210 

 G 0-00001066 

 H 0-00000980 



Crown-glass. No. 13. 



L = 0-85515./ ^■°^^- 



Observed Calculated 

 lengths. lengths. 



C 0-00001587 



D 0-00001423 0-00001422 



E 00001270 0-00001268 



F 0-00001169 0-00001167 



G 0-00001030 0-00001029 



H 0-00000947 



lengths. 



0-00001420 

 0-00001267 

 0-00001166 

 000001028 



Calculated 

 lengths. 



0-00001475 

 0-00001313 

 0-00001208 

 0-00001065 



Water. 



L = 0-91343./ '■*''^^- 



Observed Calculated 



lengths. lengths. 



C 0-00001818 



D 000001631 0-00001630 



E 0-00001456 0-00001454 



F 0-00001341 0-00001340 



G 0-00001 183 0-00001182 



HO-00001089 



Although 



