RussR
En-Route
My neighbor found this and gave it to me. I think it belonged to his brother-in-law, who was a Private Pilot in the 50's.
It is an "M2 Jimmie Mattern Computer". Basically seems like a pair of calipers with some other features around the edge.
I have never seen anything like it before. Anybody ever used one? Were they popular? It doesn't look like the owner of this one ever used it, it's brand new and in great shape. Copyright says 1949 on the instructions.
I may break it out the next time I'm teaching XC flight planning...
It is an "M2 Jimmie Mattern Computer". Basically seems like a pair of calipers with some other features around the edge.
I have never seen anything like it before. Anybody ever used one? Were they popular? It doesn't look like the owner of this one ever used it, it's brand new and in great shape. Copyright says 1949 on the instructions.
I may break it out the next time I'm teaching XC flight planning...