Ammeter 30-0-30 amps, Battery, Type D-30, US Navy PBM-5 Mariner Cold War as used in the US

as used in the US Air Force Strategic Bomber the B-36H Peacemaker (see illustration of the B-36H Engineers Station Panel from the B-36H flight manual dated 1954 showing the location of this indicator with the right red dot)

F-102 Delta Dagger

This camera

An illustration of its position on an instrument panel is in the photos - from the US Air Forces C-119 Flying Boxcar flight manual dated 1950

This is a Course Deviation Indicator type ID-453/ARN-30 as used in the Vietnam War era UH-1 Bell Huey Helicopter

Ammeter 30-0-30 amps, Battery, Type D-30, US Navy PBM-5 Mariner Cold War as used in the USHere is an aircraft battery Ammeter, Weston model 606, type T 203, 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). The battery ammeter indicates the current flow through the battery charging system. A "zero center" ammeter, during charging, shows a (+) positive reading indicating the