Oxygen Indicator, USSR, Oxygen Indicator IK-24N (ик-24н) Martin The knob on the face

The knob on the face should adjust the perspective indicator at center

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

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

the aircraft was traveling at 820 km/h

Oxygen Indicator, USSR, Oxygen Indicator IK-24N (ик-24н) Martin The knob on the faceThis 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