Bauhaus-Universität Weimar

Optical Projection: A Treatise of the Use of the Lantern in Exhibition and Scientific Demonstration
Wright, Lewis
be used. In front of the slit e through which parallel rays 
are sent from the condensers, is a Bunsen burner, a, in the 
flame of which is held an iron or platinum spoon l containing 
a good pellet of sodium, which should burst into vivid com¬ 
bustion with some white vapour, In front of the sodium is 
arranged a screen s with an aperture, to shade off all direct 
sodium light from the screen—hence this experiment is not 
well adapted for a direct prism. The light from the slit has 
all to pass through the sodium flame before it reaches the 
î’iu. 171.—He versed Sodium Line 
lens, l, and a dark line d appears in the orange-yellow of the 
By modifying the arrangement as in fig. 171 (after Muller), 
detaching the slit from the front of the lantern and placing 
the burner b on the opposite side of it from the focussing 
lens, the lens l and prism r (really two prisms) being as 
usual, both spectra can be shown together. For introducing 
by hand another tin screen t between the Bunsen-flame and 
the condensers, the radiating arc light is cut off from the 
upper part of the slit, and consequently half the spectrum on


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