(OLD VIDEO) Facial Seals - The Mechanical and Physiological Principles Involved Within

Very interesting video, I would have never really thought of different racial backgrounds affect gas masks. It’s really cool that you put a lot of effort into your videos because they are always fun to watch.

Hey duke I need some help here my parents got me what I believe to be a American tissot mask for $20 and it’s all mummified but otherwise in almost pristine condition I was wondering if you know a easy way to soften up the canvas rubber material.