Vl.tiliivBrit. Inch 



Sec"Rec/terches sur I es S/beetres des Metalloides,jbar Jl.J. AnjstriJm. et T.R.T/ia/en, 



( Jixt rait des M>va Acta 7?ey. Sec. Uftsal. Jkr. Ill , Ycl. ZT.) 



Vjb sal, Ed. Berlino , Tm&rtmeur de l'1/niversite. f8f5". 



.Piazzi Smyth into its Compo nent Lines, and these 

 ession by Professor Alexander S.H erschel , M*r W3. 



/3 



/U 







*7 





/4 



1 1 ii H N iiiiinii iiir iiiiiiiii | iiiiiiiii|iiii|iiii i inm nT] 



,020 ,Q30 * ,Ob*> ,OkO * fi'jO * ,Oi 



'.'I 

 080 * ,090 



IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIUIIIIIIIIIIIIIIIIIIIIIIIUIIIIIIII 



4-%ofo 



,//0 ,/ZO ,130 ,// t 



Af/oo 





#),IS~0 









—J 1 m , 



PLATE LXXVIII, 



OR 31 



TRANSACTIONS R.S.E. 



VOL. XXXII. 



Theoretical Arith. Progression. 



/ + 2 +3+/ h + j-+6-t-7+B-i-y-t-/0-h//-t-/l -W3-w4--f-/.r-t-;6 -t-tj -*-Xe. 



Split- line Spectrum produced upwards. 



OBSERVATIONAL, 



ts/Z. 



Every Line, 



in Negative Representation, 



EXACTLY AS MEASURED, 



Full Siz.e ofthe Instrumental Record. 



Main-line Spectrum produced downwards. 



Theoretical Arithm. Progression aqain, 

 Beginning, on 5- Line of First Series. 



Spectrum-Place in Wave-Number pe^ Br. Inch, 

 Approximately only. 



Split- Line S 



IMain-Line Spectrum Set 10 



t r u m , I 



UNIT3 BACK^ 



Com pared with 



T.H. 4<(2. 



\ 



