Master Indicator, Type N-1 Compass System plus Service Manual B-29 The center knob is to

The center knob is to set the desired course and to cage the gyro

P-47 Thunderbolt

according to its markings

This is an original 1960's-era Instrument Flight Manual for the Naval Air Training and Operating Procedures Standardization Program (aka NATOPS

we discovered that we

Master Indicator, Type N-1 Compass System plus Service Manual B-29 The center knob is toThis is a Master Indicator used in the N 1 Compass System by aircraft of the US Air Force during the 1950's and into the 1960's. The N 1 system is a remote indicating, gyro stabilized compass system designed for use in all latitudes, which is what made it unique at the time. The N 1 system was commonly used in early models of the US Air Force bomber B 52 Stratofortress, transport C 130 Hercules, and air tanker KC 135. It was installed at the