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YMCA, 1914–1926

 File — Box: 78, Folder: 5
Identifier: HaleGE_02_0D_078_05
YMCA still image
YMCA still image

Scope and Contents

From the Collection:

This collection provides a thorough record of George Ellery Hale’s activities. A prolific correspondent, Hale kept copies of most of his letters. The collections contains significant material relating to the theoretical and instrumental development of astrophysics, the history of the Mount Wilson and Palomar Observatories, and the early history of the California Institute of Technology. It also documents Hale’s work with the National Academy of Sciences and National Research Council.


  • Creation: 1914–1926


Conditions Governing Access

Most of this collection is available on the web, linked from individual folder records in this finding aid. The original paper copies of the first nine series are located at the Caltech Archives, where access is available to anyone conducting research for which it is necessary; please contact the Caltech Archives to make an appointment. The original Director’s Files of the Mount Wilson Observatory are located at the Huntington Library, where they are available to qualified researchers by application through their Reader Services Department.


38 pages

Language of Materials

From the Collection: English

Existence and Location of Copies

This folder is represented in the microfilm edition of the Hale Papers by reel 67, frames 173 to 211.

Repository Details

Part of the California Institute of Technology Archives and Special Collections Repository

1200 East California Blvd.
MC B215-74
Pasadena California 91125 United States of America
(626) 395-2704