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I'm an old physicist (got my PhD in 1963). At present I enjoy reading books concerning the history of past century research and discoveries.I'm posting this message just to express how upset I get every time a writer introducesthe subject of the value of spectroscopy in advancing on the knowledge of the atomicstructure . EVERYBODY , without an exception, describes the effect of looking at the lightcoming out from a heated element and passing through a prism, speaking of "a spectrum of lines".How an average person should imagine that lines are formed without making the light pass trough a screen containing a slit before getting into the prism.They are so accustomed to see a set of colored lines called "spectrum" that forget to explain a simple but necessary passage. I have got in my library around twenty bookswhose author forgot to explain this simple detail. Sorry for the outburst, but I hope some of these writers read me and corrects their next edition! Thanks for your patience,Paolo.