Spectrograph, DTM Image Tube

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    There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page.

    IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu

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    Spectrograph, DTM Image Tube

    Wedge shaped bare metal box with black cylinder containing image tube camera.

    1 of 3

    Usage Conditions Apply

    There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page.

    IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu

    View Manifest

    View in Mirador Viewer

    Spectrograph, DTM Image Tube

    Wedge shaped bare metal box with black cylinder containing image tube camera.

    2 of 3

    Usage Conditions Apply

    There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page.

    IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu

    View Manifest

    View in Mirador Viewer

    Spectrograph, DTM Image Tube

    Wedge shaped bare metal box with black cylinder containing image tube camera.

    3 of 3

Display Status:

This object is on display in the Explore the Universe exhibition at the National Air and Space Museum in Washington, DC.

Original Image Tube Spectrograph built in the early 1960s by W. Kent Ford, Jr., which he then used in collaboration with Vera Rubin to explore an observational problem she had developed: to determine the detailed rotational properties of galaxies. The cascaded image tube developed by Ford at the Carnegie and then manufactured by RCA improved quantum efficiency of photographic detectors by over a factor of ten and made it feasible to perform difficult observational programs like this. Analysis of observational data from this instrument led Rubin to the conclusion that there was a huge amount of unseen mass distributed throughout the visible matter in galaxies causing them to rotate like rigid bodies. This observation yielded evidence for the existence of dark matter that stimulated general acknowledgement that it forms much of the mass in the universe. For her revolutionary work, Vera Rubin was the second woman in history to be awarded the Gold Medal of England's Royal Astronomical Society.