Bauhaus-Universität Weimar

The Art of Projecting. A Manual of Experimentation in Physics, Chemistry, and Natural History with the Porte Lumière and Magic Lantern
Dolbear, A. E.
upon the rotator, they can be made to slide by each 
other so as to expose a greater or less angle of any 
color. By using any two or more of these at a time, 
many interesting effects from combined colors can be 
One may often find colored stars or rings or other 
fanciful designs on posters for advertisements or wrap¬ 
pings on goods of various sorts, which may be utilized 
with the rotator in studying color, 
Fraunhofer’s lines. 
The solar spectrum as usually projected with around 
orifice and common prism, with an included angle of 
6o°, appears complete, and is often called a pure spec¬ 
trum. If, however, the prism be of flint-glass or, better 
still, a bottle prism filled with bisulphide of carbon, it 
may be placed in such a position as to present the 
absorption lines known as Fraunhofer’s. 
Fig. SS. 
To do this it will only be necessary to place the 
prism in the full beam from the porte lumière and turn 
it so that one side is very nearly parallel with the beam. 
A spectrum will be formed containing a number of 
dark perpendicular lines known as the C D E F and 
G lines. These may be still more marked by placing


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