Ammeter, DC, Dual Engine, Weston 827 Type 28Y1, C-121 Lockheed Constellation PV-1 Ventura but could be removed and

but could be removed and cleaned

Here is a 1940's vintage electrical Free Air Temperature Indicator

This remote tuner was typically positioned within arms length distance of the pilot in order to mechanically tune the receiving radio to the desired frequency

The photos show both the external and internal workings of the gun sight: an exquisite electro-mechanical computer developed well before the era of microchips

Ammeter, DC, Dual Engine, Weston 827 Type 28Y1, C-121 Lockheed Constellation PV-1 Ventura but could be removed andThis is a dual DC Ammeter, 0 450 amps, as used in the US Air Force C 121 transport version of the Lockheed Constellation. See photo of the location of the instrument on the MJB 1 control panel from the C 121 flight manual dated 1958. This instrument has a date stamp of 1957. Measures 3. 25 inches diameter and 3 inches deep.