<span>Three reprints of Changes in the Density of the Ether and Optical Effects of Changes in Ether Density, read by Brush on June 30, 1908 before the American Association for the Advancement of Science, discussing experiments </span><span>conducted by Brush exploring the susceptibility of the ether to a change in density or pressure. Digital copy includes scan of first bookCharles F. Brush, Sr., PapersSeries 7: Articles by Charles F. Brush (1879-1929)Box 25Folder 9</span>

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