Spectrograph, Grazing Incidence, NRL, Mock-up


Display Status:

This object is on display in the Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.

Spectrograph, Grazing Incidence, NRL, Mock-up

Collection Item Summary:

This is a mockup of a grazing incidence X-ray spectrometer typical of those flown by the Naval Research Laboratory (NRL) on Aerobee sounding rockets in the 1950s. This so-called "breadboard model" was built at NRL from discarded Aerobee Model IV era parts by DeWitt Purcell. He also incorporated several pieces from an original flight instrument. It has a shiny metal cover, which is removed for display. It was transferred to NASM in 1993.

Collection Item Long Description:

Inventory Number


Credit Line

Transferred from the Naval Research Laboratory

Country of Origin

United States of America


Overall - all metallic except for electrical insulation and optical components


3-D: 25.4 x 10.2 x 5.1cm (10 x 4 x 2 in.)

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum



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