Cowl Flap Position Indicator, Bendix Magnesyn, C-121 Lockheed Constellation P-51 The Wing De-icing System worked

The Wing De-icing System worked by channeling (or bleeding) heated air from the engines thru ducts to the wings

as appeared in aircraft such as the Grumman S2E Tracker and Lockheed P2V-7 Neptune Antisubmarine Warfare aircraft (according to their flight manuals

and the internal mechanism can be removed to reveal the electrical gyroscope

not gallons

likely used by the US military during the 1940-50s: AC 0-30 Volts

Cowl Flap Position Indicator, Bendix Magnesyn, C-121 Lockheed Constellation P-51 The Wing De-icing System workedThis is a dual Cowl Flap Position indicator 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 Flight Engineers upper instrument panel from the C 121 flight manual dated 1958. It has a date stamp of Dec 1956 on the side case. Measures 3. 25 inches diameter and ~3 inches deep.