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Scientific apparatus and instruments

Quartz Spectrograph

  • 1900 – 1925

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A spectrograph is an instrument used to obtain and record a light spectrum—it splits the light from an object into its component wavelengths so that it can be analysed. The spectral lines of a chemical element is produced and photographed by the spectrograph. When the photographic plate is developed, the spectral lines are precisely measured to determine the composition of the chemical element.

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Science History Institute. Quartz Spectrograph. Photograph, 2017. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1g05fc15t.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.