<span>5 Typed letters between Richard Millikan and Charles F., Sr., discussing potential flaws in Brush's free-fall experiments which Brush believed demonstrated a different mass-weight ratio in various elements, and Brush's later </span><span>experiments with the Bureau of Standards exploring spontaneous generation of heat in igneous rocks. Letters dated 1923, 1924, 1926.Charles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 3: Business and Professional (1876-1931)Box 5Folder 6</span>

Millikan, Robert A., 1923-1926

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