Temperature Indicator, Electrical, 160deg C, Luftwaffe Fl.20358 FW190 PBM-5 Mariner A volume of air enters

A volume of air enters the mouth of the tube

in practice direction was replaced by friendly cooperation

Here is an aerial refueling nozzle

It has a manufacturing date of Oct 1941

Temperature Indicator, Electrical, 160deg C, Luftwaffe Fl.20358 FW190 PBM-5 Mariner A volume of air entersHere is a WWII era electrical Temperature Indicator used in aircraft of the German Luftwaffe, measuring temperature from 10 deg C to 160 deg C. Likely used to measure cylinder head or oil temperature, the flexibility facilitated by the adjustable limit pointers. It is labeled Fl. 20358, and was made by Hartmann & Braun. According to references on the internet, this instrument appeared in Luftwaffe aircraft Focke Wulf 190 D 9, FW Ta 152, Dornier Do