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Chronicling America is a searchable digital collection of historic newspaper pages through 1963 sponsored jointly by the National Endowment for the Humanities and the Library of Congress.
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Also, see the Directory of U.S. Newspapers in American Libraries, a searchable index to newspapers published in the United States since 1690, which helps researchers identify what titles exist for a specific place and time, and how to access them.
Completed in 1905 in Pasadena, California, the Mount Wilson Observatory served as an observation and research center for some of the brightest astronomers of the day. In 1917, the world’s largest telescope, the Hooker Telescope, was installed at the Mount Wilson Observatory, providing a powerful tool to astronomers for years to come. Read more about it!
The information in this guide focuses on primary source materials found in the digitized historic newspapers from the digital collection Chronicling America.
The timeline below highlights important dates related to this topic and a section of this guide provides some suggested search strategies for further research in the collection.
| 1905 | Mount Wilson Observatory opens in Pasadena, California. |
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| 1906 | A special automobile is used to move the 60 inch telescope lens up to the Mount Wilson Observatory. |
| 1913 | Research conducted at Mount Wilson Observatory proves that volcanic ash in the Earth’s atmosphere lowers the surface temperature. |
| 1917 | The world’s largest telescope, with a lens of 100 inches, is installed at the observatory. |
