LIST OF ALL THE PLATES CONTAINED HEREIN, 



VIZ. 29 DOUBLE-PAGE PLATES, AND 2 LONG FOLDING PLATES, AS BELOW. 



R. S. E.'S 

 VOU Ml 



M'.v 



THIS 



paper's 



NUSI 



GENERAL SUBJECT. 



PARTICULAR DETAILS. 



XLVIII. 

 XLIX. 



L. 



LI. 



1 



2 



3 

 4 



CH 



IN BLOW-PIPE FLAME; 



on a JfO foot 



Spectrum, length. 



Orange band, and Citron band. 

 Citron band continued, and Green band . 

 Green band continued, and Blue band. 

 Violet band at the end thereof. 



Lll. 



5 



Characteristics of several methods of Gaseous -Incandescence. A single- 

 page Representation. 



Llll. 

 LIV. 



6 



7 



OH again, but in 



Vacuum Tubes,' and 



by Electric Spark. 



Citron band a. id Green band. 



Green, Blue, Violet and Marsh Vi. bands. 



LV. 



LVI. 



LVII. 



LVIII. 



LIX. 



8 

 9 



10 

 11 

 12 



CO, 



in Vacuum.' Tubes, 



on the same 



40 foot Spectrum 



length. 



Red band and Scarlet band. 

 Orange band and Yellow band. 

 Yellow band and Citron band. 

 Green band and Blue band. 

 Indigo band and Violet band. 



LX. 



LXI. 



LXII. 



LXIII. 



LXIV. 



LXV. 



13 

 14 

 15 

 16 

 17 

 18 



H, 



in Vacuum Tubes, 

 on same Scale. 



Early Red, Red, and Scarlet, regions. 



Orange, Yellow and Citron regions. 



Citron to Green, region. 



Green, Glaucous, and Blue regions. 



Blue and Indigo regions. 



Violet region. 



LXVI. 

 LXVIl. 

 LXVIII. 

 LXIX. 



19 

 20 

 21 

 22 



o, 



in Vacuum Tubes, 

 on same Scale. 



Ultra Red, Red and Scarlet regions. 



Orange and Yellow regions. 



Citron to Green, region. 



Glaucous to Violet, region. N.B.—The Glaucous- 

 coloured Oxygen triplets at 50,630 and 51,160 

 W.N. PI. respectively, should be decreased some- 

 what in intensity and size. 



LXX. 



LXXI. 



LXXII. 



LXXIII. 



LXIV. 



LXV. 

 LXVI. 



23 

 24 

 25 

 26 

 27 

 28 

 29 



N, 



in Vacuum Tubes, 

 on same Scale. 



Ultra Red region. 

 Red and Scarlet, regions. 

 Yellow and Citron, regions. 

 Citron and Green, regions. 

 Glaucous and Blue, regions, 

 Blue and Indigo, regions. 

 Violet regions. 



LXXVII. 



30 



Long, folding, Index Map, on a very small Spectrum scale, of all the 

 above, and some other, Gases, at both high, and loir, Electric 

 temperatures; intended to serve as a Frontispiece and useful Key, 

 to the whole. 



LXXVIII. 



31 



Long, folding Plate of Green CO's extra CH's green, portion. Full size of 

 original instrumental record, viz. on a 120 foot Spectrum length (A to 

 H of Fraunhofer) ; with, explication of its remarkable double Arith- 

 metical Series of construction, by Professor Alex. S. Herschel, M.A., 

 College of Science, Newcastle- on -Tyne. 





