I don't mean to be pedantic, but run a spell-checker!
(First paragraph, first line: "rebreahers" vs "rebreathers"
If you want to get ridd of the silly blue line at the bottom of the page, send me the original document and I'll be happy to convert it for you (put your name under the title - it's original work).
writing "don't try this at home" is the best way of making sure people actually do - hell, I'll go looking for bucket as soon as I get back home
Very nice work, especially the drawing
J