These 1940s/50s USAF "flight computers" were used to calculate airspeed and altitude. Comes with original packaging: $20 for a set of two (cheap!).
(via Red Ferret)
These 1940s/50s USAF "flight computers" were used to calculate airspeed and altitude. Comes with original packaging: $20 for a set of two (cheap!).
(via Red Ferret)