Does anyone know the original source for this image?
I've seen it in so many places and for so long on the web that I am not sure where it first appeared. I believe it came from http://www.saami.org/unsafe3.htm but that link is no longer active. IIRC that page had a detailed description of pressures etc. to outline the differences.
I'd like to find the actual, original, source for the above image, or an alternate source that has the same specs for chamber dimensions such that I could make my own version of the above and give proper credit.



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