Three reprints of Some Diffraction Phenomena Superposed Fringes. Published in The Proceedings of the American Philosophical Society, Volume 52, Number Show moreThree reprints of Some Diffraction Phenomena Superposed Fringes. Published in The Proceedings of the American Philosophical Society, Volume 52, Number 209, April 1913. Brush discusses his experiments in observation of fringe edges within a millimeter or two of the diffracting edge, by means of a microscope. Also includes 2 large copies of the illustrations from the article. Charles F. Brush, Sr., Papers Series 7: Articles by Charles F. Brush (1879-1929) Box 25 Folder 12 Show less