Bauhaus-Universität Weimar

Titel:
Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Person:
Gage, Henry Simon and Henry Phelps Gage
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39438/644/
636 
PROJECTION OF SPECTRA 
[Ch. XV 
the paper with a brush. This screen will show a brilliant green 
fluorescence wherever ultra-violet light strikes it. When the 
spectrum of an arc is projected upon such a screen, not only is the 
visible red, green, and blue to be seen, but also beyond the blue end 
is a vivid green fluorescence which indicates the presence of ultra¬ 
violet light. 
Fic.. 364. Illumination of the Slit for the Projection of .Spectra. 
.1 The image of the arc focused to a small spot on the slit. The objective 0 
is filled with light. The spectrum will be bright but a mere line. 
B The image of the arc slightly out of focus giving a higher spectrum but 
not so bright. 
C The slit next to the condenser in the lantern-slide position. This gives 
a relatively dim spectrum and illuminates a greater height of slit than is used 
for the spectrum. 
§ 900. Illumination of the slit.—Excellent results may be 
obtained by focusing the arc on the slit by the condenser. This 
gives an intense illumination but the spectrum is not very high, in 
fact, it may be a mere line of color. To remedy this, the slit may 
be brought closer to the condenser than the crater image. Thit 
increases the height of the spectrum but reduces its intensity. Is
        

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