Author: BBC

The iron lung uses a negative pressure system. Powered by a motor, its bellows suck air out of the cylinder, creating a vacuum around the patient’s body and forcing the lungs to expand and take in air. When the air is let back in, the same process in reverse makes the lungs deflate. The device needs a source of energy to function.

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But as she and her family face whatever lies ahead, there’s anger at what some perceive as bullying of the princess, with the suggestion that she was forced into making the video, rather than the more usual route of a written statement, by the relentless and far-fetched swirling conspiracy theories. Source link

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