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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