Gyrosyn Compass C-2A Sperry Master Indicator 653894-6B C-119 Boxcar USAF P-2 Neptune In this specimen

In this specimen

as appeared on the flight engineers panel of aircraft of the US Navy such as the patrol bomber / seaplane PBM-5 Mariner (see illustration showing the location on the panel from the PBM-5 flight manual dated 1944)

Also note the photo of the fuel tank locations in a B-36H with their capacities in gallons (note that the gages indicate fuel in pounds

There is no noticeable swing or waver

now currently the aircraft is in the US and reported as airworthy as of the date of this entry

Gyrosyn Compass C-2A Sperry Master Indicator 653894-6B C-119 Boxcar USAF P-2 Neptune In this specimenThis is a Gyrosyn Compass Master Indicator Type C 2A made by Sperry part number 653894 6B. The Master Indicator was part of a 5 module system combining the functions of a directional indicator and a magnetic compass, introduced in the late 1940's. See the diagram of the system with an explation of its function in the photo gallery, including a diagram of this specific indicator. An illustration of its position on an instrument panel is in the photos