Automatic Interval Finder, Fairchild


Display Status:

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

Automatic Interval Finder, Fairchild

Collection Item Summary:

This device translates the ground speed of an aircraft into the proper time interval between pictures. This is done by adjusting the speed of a movable bar to follow the speed of ground objects as they cross the view finder field. Connected to a K-3A camera by cables, the finder automatically trips the shutter when the correct area has been covered and then repeats for the next field of view.

Collection Item Long Description:

Inventory Number


Physical Description

12-3/4in. long; has 8-1/2in. ef , F.45 lens; automatic interval finder, viewer. Has lined case, 2 power cords. Bausch & Lomb lens.

Credit Line

Transferred from the U.S. Navy

Country of Origin

United States of America


3-D: 32.4cm (12 3/4 in.)

Data Source

National Air and Space Museum

Restrictions & Rights

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