Typescript list of scientists involved with Mount Wilson Observatory's ruling engines. The sheet reads as follows:"1912-1928 John A. Anderson & C. Jacomini. 1929-1949 Harold D. Babcock & Elmer Prall '32-'50. 1949-1963 Horace W. Babcock & Prall ; Swanson '50-'59 ; Roberts '59-'63." Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Scientists Spectrum analysis--Instruments Diffraction gratings Anderson, John A. (John Augustus), 1876-1959 Jacomini, C. (Clement) Babcock, Harold D. (Harold Delos), 1882-1968 Prall, Elmer Babcock, Horace W Photographic prints. (gmgpc)
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