Echo I, "Measured Physical and Optical Properties of the PAGEOS and the Echo I," April 15-17, 1971

The Echo I and II subseries contains literature and product samples related to these two satellite balloons, including the Echo I “communications for peace (postage) stamp," which was commissioned by WLOL radio in the Twin Cities. There are also government publications which relate to Echo I, such as the Measured Physical and Optical Properties of the PAGEOS and the Echo I, which was presented at the Symposium on the Use of Artificial Satellites for Geology, in Washington, D.C., on April 15-17, 1971, and the Project Echo II final report, which was a study commissioned by NASA and done at Sheldahl, in Northfield, MN. The Company was the primary contractor for the Echo II Program. There are also files which contain information about the Echo I and II satellite balloons, as well as samples of Echo I and Echo II skins, and a file containing information about an art exhibition by artist Les Levine in 1967, at the Architectural League in New York City, which featured rooms made of Sheldahl’s Mylar laminates.