https://web.archive.org/web/20120429214314/http://www.airspacemag.com/history-of-flight/Moments-and-Milestones-The-Pressures-On.html https://web.archive.org/web

https://web.archive.org/web/20120429214314/http://www.airspacemag.com/history-of-flight/Moments-and-Milestones-The-Pressures-On.html https://web.archive.org/web/20120429214314/http://www.airspa... Haven't read it to find the answer to your question yet, but bless the Internet Archive