Signedunsigned
Historical AttributesThese are Anderson prisms which were part of a spectrohelioscope designed by George Ellery Hale in 1928.
Primary SourcesGeorge E. Hale, "The Spectrohelioscope and its Work," Astrophysical Journal, 70 (1929): 265-311.
Howell and Sherburne, "The New Hale Spectrohelioscope" (Pasadena, ca. 1929).
advertising booklet.
E. Pettit, "An Optical Improvement in the Spectrohelioscope," Publications of the Astronomical Society of the Pacific, 51: 95.
ProvenanceFrom Agassiz Station, Harvard College Observatory, 1969.