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Physics wall chart of spectra showing a colored spectrum with dark lines, plus sodium and potassium emission strips below.

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Spectra, R. Menzel (1908). Via artnap.com

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About this work

A chromolithographed physics wall chart showing solar and elemental spectra, with a colored continuous band marked by Fraunhofer lines and a numbered scale above. Two additional strips below display the sodium (Na) and potassium (K) emission spectra.