Top figure is a laboratory spectrometer with a polarizing attachment. Lower figure is a spectrometer with a third arm and camera attachment.
Wm. Gaertner & Company. “Spectrometers with Polarizing Attachment and Camera Attachment.” Instruments of Precision Laboratory Apparatus, M-L Catalog. Chicago, Illinois, 1911. https://digital.sciencehistory.org/works/4t64gn20s.
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