66 J. C. F. Zillner on a new Spectroscope. 
first removing it from its place of equilibrium and then releas- 
ing it. Next then, the aperture of the slit was so far decreased, 
that, with the slit at rest, the double line D and, peonae 
faint, the lithium line also appeared sharply defined in the fiel 
As soon as the slit was put in oscillation, these lines trans- 
formed themselves into sharp images of the alcohol flame, of 
which the two sodium images covered about half. The appa- 
rent brightness of these three images was much less than that 
of the bright lines, and in consequence of this also their relief 
from the diffusely illuminated spectrum ground was in the same 
ries less distinct than that of the lines with the slit in a state 
or rest. 
theoretical discussion to be in accordance wi 
appeared quite strongly to incline our favor to the method last 
employe 
upon a very considerable relative Lange | of the protube- 
ith whi 
gal 
especially the mid hi 
by an actual inspection on the 24th of December of the past 
