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- Title: Fourth Lecture (First Scientific Lecture-Course)
- IVg). Suppose this is a prism and this a sodium flame — a
- flame in which the metal sodium is volatilizing. The sodium is turned
- to gas; it burns and volatilizes. We make a spectrum of the sodium as
- find one place in the spectrum strongly developed. For sodium light
- spectrum of sodium. The rest of the spectrum is stunted —
- example, that there is sodium in the flame. So we can recognize which
- we interpose the sodium flame, so that the glowing sodium somehow
- now the yellow of the sodium flame is added to it. But this is not
- what happens. On the contrary, the yellow of the sodium flame
- force that is brought to bear. If the sodium light arising here were
- Title: Fifth Lecture (First Scientific Lecture-Course)
- with glowing sodium gas: in the midst of a very feeble spectrum there
- even darker by contrast. Sodium is therefore often spoken of as
- the continuous spectrum and the one generating, say, the sodium line,
- can take effect as it were simultaneously, the sodium line will be
- spectrum when we interpose the glowing sodium. We have not been able
- Title: Sixth Lecture (First Scientific Lecture-Course)
- elasticity of the ether the extinction of the sodium line for
- spectrum, in which we either create or extinguish the sodium line
- (i.e., in the latter case, we generate the black sodium line). If
- of light. The sodium line is extinguished in its old place and for
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