Spectrograph mounting for the National Academy of Sciences building in Washington, D.C. The spectrograph is in the center of the photograph, inside a room or laboratory. Behind the spectrograph is a wooden storage cabinet mounted on the wall. On top of the cabinet is a fan and a clock. Below the cabinet a counter runs the length of the wall. On the right-hand side, a wooden stool is seen just below the counter. Other scientific instruments can be seen in the room. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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