<span>Handwritten postcard from Charles Sawyer to Charles F., Sr., thanking Brush for sending latest gravitation paper and informing Brush of groundbreaking for addition to college </span><span>library. Front of postcard has picture of Hiram, Ohio’s library and observatoryCharles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 2Folder 14</span>

Acknowledgements for Brush’s article, “Discussion of a Kinetic Theory of Gravitation, II, and Some New Experiments in Gravitation,” (1922 paper), 1922/

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