﻿8. jP. Langley — Unrecognized Wave-lengths. 



99 



Source 



of 

 Heat. 



Ware 

 Length. 



Grat- 

 ing. 



Refracting 

 Angle. 



Temper- 

 ature. 



Observed 

 Deviation. 



Me an Devi- i ndex of 



1 *££?,?♦««» 1 Refraction, 

 duced to 60°. 



Arc 



5 x AD 2 = 

 2-9451 



No. 1 



59° 58' 20" 

 59 57 45 



19° 



21-8 



a 



a 



a 

 a 



23-8 



a 



26-4 



a 



14 

 16 



15 



a 

 a 



15 



a 



a 



23-8 



a 

 ti 



15 



a 



a 



a 

 a 



15-4 



a 

 (i 



39° 14' 42' 



15 06 



16 48 



16 30 

 15 18 



17 42 

 17 24 



15 36 



16 00 

 16 18 

 15 54 



15 48 



16 30 

 15 48 

 15 12 

 15 36 



39 04 00 

 06 48 

 06 24 

 08 54 

 10 00 

 9 30 

 8 30 



39 02 18 



01 48 



00 30 



02 00 



01 36 



00 48 



01 42 

 00 42 



38 51 18 

 50 48 

 52 12 

 54 42 

 54 42 



54 12 

 57 36 



55 18 



38 45 12 

 45 42 



47 12 



48 48 

 47 18 













































































1 























































No. 2 

























39°18'1~2" 



±2"-4 













1-5243 ±-0000 



Arc 



6xAD 2 = 

 3-5341 



No. 1 



59 58 20 

 59 57 45 





























































39 09 54 

 ±30" 



1-5227 ±-0002 



Arc 



7xAD 2 = 



4-1231 



No. 1 



59 57 45 











































































39 03 42 



±12" 



1-5215±-0001 



Arc 



8xAD 2 = 

 4-7121 



No. 1 



59 57 45 













































































38 56 06 

 ±30" 



1-5201 ±-0002 



Arc 



9 x AD 2 = 

 5-3011 



No. 1 



59 57 45 



































38 48 06 

 ±30" 



1-5186 ±-0002 











Am. Jour. Sci.— Third Series, Vol. XXXII, No. 1 1 



7 



-August, 1886. 



