10 • -^it- 8.— Y. Takahashi : 



tlie otliei" in tlio increased field — , and the separations of tliese lines 

 were not measnred for strong fields. 



As 4404"75 came out most sharply in many plates, its separa- 

 tion was taken as the standard, and tlie separations of tlie other 

 lines were compared with it, without any anticipation of the 

 absolute value of the magnetic field. The magnetic fields given 

 in the following were calculated from the separation of the above 

 line assuming the specific separation 



-'^' = 1-0G4X10-*. 

 /-H 



which was borrowed from the result of Mr. YannuhV^ who found 

 that the separation is proportional to the magnetic field by com- 

 paring the separation of this line with that of tlie zinc line 4ß''^0. 

 As my observation extends both in weak and strong fields beyond 

 the limits in his experiment, it may be objected that the calcula- 

 tion of the field for these portions is an extrapolation, but the 

 linear relation between the magnetic field and tlie separations of 

 many sharp lines shows that the separation of 4404 "75 is propor- 

 tional to the maiiiietic fieLl. 



/. Nine Strong Linc^ in the Violet R(yio/i. 



;> 44I5'!3, at the end of the first three lines towaid the red, 

 appears as a triplet in weak fields. The intensity of this fine is 

 comparable with that of 44(-)4'75 in the spark spectrum witbout or 

 with a weak magnetic fichb but, when the field is increased, all the 

 three components become diffuse and weak, so tliat it is difiicult 

 to stud}' the behavior fully in strong fields with tlie eclielon 

 spectroscope. On AVratten double instantaneous ])Iates pho- 

 tographed with fields of .'îoBôU and o72oO gauss 1 liave ol »served 

 its fine resolution, giving at least 3/)-an<l -1/rcomponeiüs. King"^ 

 also assumes tlie line to be septuple from the broadening of the 



1) Vamada, Jour. Sei. Coll., Impei-ial University, Tokyo, V.l. XLL, Art. 7. 



2) King, The Influence of a Magnetic FieUl upon the Spark Spectra of li-on an<l Titanium, 

 Paiwrs of the Mt. Wilson Solar Observatory, Vol. II., Part I. 



