North American Aviation Military Aircraft Brochures, lot of 33, 1950s Sperry This is an original WWII-era

This is an original WWII-era Orterkompass OK42

made in 1955

an attachable ring and bead back-up sight in case of electrical failure of the sight

Static pressure is the atmospheric pressure of the air at whatever altitude the aircraft may be flying

The long pointer rotates clockwise from the 6 o'clock position indicating altitude in 100 Meters

North American Aviation Military Aircraft Brochures, lot of 33, 1950s Sperry This is an original WWII-eraThis is an original lot of 33 individual public information brochures on aircraft made by the North American Aircraft Aviation, Inc. and in service by the USAF and USN in the late 1940's and early 1950's. The three colors of the brochures may indicate 3 different series, blue, green, and orange. Each brochure includes a cut out stand and instructions for mounting the photo of the aircraft on the stand. Each tri fold brochure measures 9. 5 x 5 inches.