Oxygen Indicator, USSR, Oxygen Indicator IK-24N (ик-24н) Martin The A-5 system appeared in

The A-5 system appeared in aircraft manufactured during or before 1943

5 inches across and ~7 inches deep

and versions of bombers B-47 and early B-52s

B-25 and others

The side label is partially removed

Oxygen Indicator, USSR, Oxygen Indicator IK-24N (ик-24н) Martin The A-5 system appeared inThis is a fine example of a Cold War era, Soviet, Oxygen System Indicator as used in the USSR Air Force aircraft. The indicator measure and conveys the system oxygen pressure (i. e., quantity) up to 150 kilograms square centimeter, via the pointer in the upper half of the display. The indicator also provides visual indicator of oxygen flow similar to the WWII era "blinker" device: as the pilot inhales exhales, the two white 'eyelids' below center