f ae 4 , < 
aThe upper Dp oat ofthe photograpit is 1s grids spectrum of t 7 oe 
p Nitrogen, Fe. 
‘ 
bs 
rm 
ie 
rs 
“Margin are printed 
DISCOVERY OF SaaceN IN THE SUN BY PHOTOGRAPHY, BY PROFESSOR HENRY DRAPER. M. D, 1876. 
Iron, Al. Aluminium. The figures above 
spectrum. The principal point to examine is the’coincidence of the bright Oxygen lings pyath bright lines in’ 
4000 A\0} 
‘ - > 
~ ~ 
- 
SE “the lower Art is the spectrum of the Oxygen and Nitrogen of Air, The letters and figures onthe 
ception-the photograph is absolutely free from hand work or retouching. O. indicates Oxygen; N. 
eX 
G. h, H., are prominent Solar lines at the violet etd of the 
with typé’on the negative; with ‘this, 
the Sun’s spectrum are wave-lengths; 
Draper’ BON eaeL negative} by: Bierstadt’s Albéttype process, a ae ste “ 
~ > Mie a Ee > 
Ae a Ps) 5, ae oe = Se a tid + : Ss ‘ 
i - 5 ae pe ; ~ se tae a x = a gore ; Rs — . : : we 
. aa 
ape Solar’ begets f The picture is poten, from 
Ee 
