858 Mr. Gr. A. Hemsalech and the Comte de Gramont on 

 Table II. — Zinc. 



a. Quartz spectrograph. X 215C-X 3200. 



Sources of light : ordinary direct arc, water arc, and 

 capacity spark. 



XA 2502 1 Feeble in ordinary direct arc ; strong in water arc and 

 2558 J intense in spark. 



A certain number o£ lines which are well seen in the 

 spark appear of medium strength in the water arc ; they 

 are absent from the ordinary direct arc. 



b. Uviol spectrograph. \ 3170-A, 5000. 



Sources of light : ordinary direct arc and water arc. 



XX 4630 Very strong in ordinary arc ; passing from feeble to 

 fairly strong in water arc. 

 4912 i Absent from ordinary arc ; well seen in water arc ; 

 4924 J characteristic spark lines. 



c. Glass spectrograph. A, 3600-X 7000. 



Wave- 

 lengths 



Ordinary 

 direct arc 



Direct arc 

 in 



Remarks. 



in 

 I. A. 



in 



gaseous air. 



liquid air. 





-1292-9 



1 cs 



2cs 





4629-8 



4 en 



10 Cbrv 





4680-1 



10 cs 



12 cbrv 





4722-2 



10 cs 



15 cbrv 





48105 



10 cs 



20 cbrv 





4911-7 







1 ddn 



enh. 



4924-0 







2dd n 



enh. 



51820 



2c 



6 cs 





63624 





2U cbrv 





Table III. — Cadmium, 

 a. Quartz spectrograph. \2150-X 3200. 



Sources of light : ordinary direct arc, water arc, and 

 capacity spark. 



XX 2195 Absent from ordinary direct are ; well seen in water 



arc ; fairly strong in spark. 

 2265 Reversed in ordinary direct arc and in spark ; not 



reversed in water arc. 

 2288 Intense and reversed in all three sources. 

 2313 Feeble in ordinary direct arc; strong in water arc; 



very strong in spark. 

 2321 Barely visible in ordinary direct arc ; fairly strong in 



water arc ; very strong in spark. 

 2573 I Feeble in ordinary direct arc ; strong and sharp in 

 2749 J water arc ; intense in spark. 



