Includes correspondence, postcards, manuscripts, typescripts, reprints, photographs, diaries, scrapbooks, and ephemera. Subjects include his early life in Clintonville, Wisconsin, and education at Ripon College, University of Wisconsin and Johns Hopkins University; work at the Carnegie Institute of Technology, the Allegheny Observatory, and the National Bureau of Standards; travels for research and recreation; family and relatives; work with professional organizations; conferences and meetings; revisions of the Welch Periodic Chart including fifteen final copies of revisions of charts from 1934-1965; early infrared photographic emulsions; and applied spectroscopy. The bulk of the collection dates from 1906-1966. His work in atomic spectroscopy and development of standards of length are well documented. Meggers was active with many organizations including the American Astronomical Society, the American Institute of Physics, the Argonne National Laboratory, Eastman Kodak Company, the International Astronomical Union, the Joint Commission on Spectroscopy, Lick Observatory, Mount Wilson Observatory, the National Academy of Sciences, the National Research Council, the Optical Society of America. Important correspondents include: J. S. Ames, Keivin Burns, W. W. Coblentz, Henry Crew, Taco L. de Bruin, N. Ernest Dorsey, Alfred Fowler, George R. Harrison, Elmer Hutchisson, Heinrich Kayser, C. C. Kiess, Otto LaPorte, Charlotte Moore, Henry A. Rowland, Henry Norris Russell, Frank Schlesinger, Allen Shenstone, Arnold Sommerfeld, Charles P. Snyder, Toshio Takamine, and John A. Wheeler. Family names related to Meggers with documentation in the collection include Binder, Bleck, Bork, Keske, Meserve, and Raddant.