Track-ball-type device mounted on joystick and operated by thumb. Thumball designed to enable precise input of data about two different axes to autopilot, avionics computer, or other electronic device without need for operator to remove hands from joystick or other vehicle control levers.
"Thumball" Auxiliary Data-Input Device
NASA Tech Briefs ; 12 , 3
1988-03-01
Miscellaneous
No indication
English
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