Respirators

DIY respirator Vietnam Several times in the care of a loved one who was treated in a hospital, "amateur engineers" found that squeezing air bubbles with their hands to aid breathing was extremely difficult and costly. Determined to create a machine to work instead of people, he has successfully created a personal breathing machine "made in Vietnam".

https://hackaday.com/2020/03/12/ultimate-medical-hackathon-how-fast-can-we-design-and-deploy-an-open-source-ventilator/

https://www.youtube.com/watch?v=xVNsE405UWI scuba rebreather


 * https://www.crappie.com/crappie/live-bait/349144-homemade-oxygen-generator-cost-8-a/
 * https://www.youtube.com/watch?v=jHg4Dx3rPSo homemade o2 generator

https://rebelem.com/high-flow-nasal-cannula-hfnc-part-1-how-it-works/

https://chemistry.stackexchange.com/questions/59305/production-of-hexavalent-chromium-during-electrolysis-using-a-stainless-steel-as

https://archive.org/stream/PopularMechanics1952/Popular_Mechanics_01_1952#page/n259/mode/2up emergency wooden respirator, old pop.mechanics article(iron lung)

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