r. Soc. Edink. 



Plate XXXVII. 



Approximate Spectrum Drawings for the History of 

 Sir David Brewster's Line Y in the Infra-Red of the 



Sola r Spectr u m. 



Scale of Wave Number in British Inch. 



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PHOTO-LITHO. BY A. RITCHIE & iON, EOIN. 



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