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This is the Explorer II/Explorer III spacer ring for the top of a cosmic ray payload from the University of Iowa. The object is illustrated near the top of the cylinder in Figure 42 of Ludwig's master thesis. This object is a component from the primary backup payload inventory for early Explorer payloads designed and built by the University of Iowa. This component is original and has been in George Ludwig's possession since it was built in the late 1950s, with the exception of intervals when the components were used at JPL. Donated by Dr. George Ludwig in 2006.

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 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type INSTRUMENTS-Scientific Manufacturer Dr. George H. Ludwig, University of Iowa Physics Department
 Dimensions 3-D: 15.9 × 15.9 × 3.2cm (6 1/4 × 6 1/4 × 1 1/4 in.)
 Materials Unknown Metal
Synthetic
Coating
 Inventory Number A20060086004 Credit Line Designed and Donated by Dr. George H. Ludwig. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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