File:PSM V65 D017 Rumford spectroheliograph attached to the yerkes telescope.png

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English: Rumford spectroheliograph attached to the Yerkes telescope
Date
Source Popular Science Monthly Volume 65
Author Unknown authorUnknown author

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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