North American Aviation Matrix Rule

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Country of manufacture: US,            Date of manufacture: >=1955
Diameter: 16.9 cm,          Thickness: 0.1 cm,           Weight: ____ gms
Materials: All plastic;           Cursor: no cursor
Scales:specialized
Front: Outer ring
Back: Outer ring
Gauge Marks: [       ]
Condition: C4 (Minimal Signs of Use)
Came with: Nothing
Notes: According to the seller, this rule was from the estate of the late Dr. Myron Kayton, M.Sc. Harvard University, Ph.D. Massachussetts Institute of Technology. Dr. Kayton was an internationally known authority on guidance, control, navigation, and avionics. He co-authored several texts and served as Deputy Manager for Lunar Module Guidance and Comntrol at NASA's Johnson Space Center.

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