Amazon.com description: Product Description: Measures of Double Stars was first published in 1930. Minnesota Archive Editions uses digital technology to make long-unavailable books once again accessible, and are published unaltered from the original University of Minnesota Press editions. This volume is a collection of the life work of Francis P. Leavenworth, for thirty-five years a professor of astronomy at the University of Minnesota. A number of measurements made by William O. Beal, assistant professor of astronomy at Minnesota, are included. The records in the book were made during a period of forty years and consist of 2,988 annual means and measures of 1,185 stars. The work of compilation was begun by William Beal with the assistance of John S. Allen of Colgate University and completed under the direction of Professor Clifford C. Crump of Yerkes Observatory.