Plate of figures for Dunham's 1938 exhibit on interstellar space. This place features a list of astronomical observatories at the far left, and a series of corresponding dots and dashes at the far right. The observatories listed are: Mount Wilson, Pasadena, Cal. ; M.I.T., Cambridge, Mass.; Adler Planetarium, Chicago, Ill.; Huancayo, Peru; Cook Observatory, PA; Pomona College, Cal.; Canberra, Australia; Nanking, China; Watheroo, Australia; Kodaikanal, india; Tashkent, Tirkestan; Beyrout, Syria; Meudon, France; Cambridge, England; Greenwich, England; Ewhurst, England; Zurich, Switzerland; Kharkov, Russia; Worthing, England, Arcetri, Italy; and Yerkes Observatory, Wis. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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