Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer 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
Date 1887-1903 Country of Origin United States of America Type EQUIPMENT-Test Manufacturer Smithsonian Institution
 Physical Description A flat, circular base is present with a distinct, elevated outer ring. Betweem this outer ring and a large rounded knob in the center is an inner ring toward the base of the knob. Multiple holes on the top of the knob indicate that something was nailed on it for support. Dimensions 3-D (Overall): 11.4 × 10.2cm (4 1/2 in. × 4 in.)
 Materials Wood
Leather
Copper Alloy
Ferrous Alloy
 Inventory Number A19820933000 Credit Line Transferred from the Smithsonian Institution to the United States National Museum. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.