<span>Typed letter from Frederick A. Henry to Charles F., Sr., thanking Brush for sending a copy of the address on Kinetic theory of gravitation </span><span>given by Brush at the Franklin InstituteCharles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 3Folder 6</span>
Acknowledgements for Brush's address "Some Experimental Evidence Supporting the Kinetic Theory of Gravitation," delivered at the Franklin Institute upon Receiving Franklin Metal, May 16, 1928
Acknowledgements for Brush's address "Some Experimental Evidence Supporting the Kinetic Theory of Gravitation," delivered at the Franklin Institute upon Receiving Franklin Metal, May 16, 1928