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Post by tomcatpc on Oct 11, 2019 17:31:16 GMT -8
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Post by scubalawyer on Oct 12, 2019 5:17:46 GMT -8
Wow, that brings back memories. We had a relative (cousin I think) who was a high ranking Naval Officer (retired from a Pentagon assignment as an Admiral as I recall but don't know much else about him). Anyway, around Christmas 1970 he stopped by our house and gave my dad that manual hot off the presses. Dad wasn't so interested in the physics or technical side of diving, he just wanted to know enough to get underwater to spear as many halibut as possible while throwing the occasional lobster and abalone in his game bag. I commandeered the manual and devoured every word, diagram and chart. Amazing what will bring back such vivid memories. M
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Post by SeaRat on Oct 12, 2019 8:33:41 GMT -8
I still have my U.S. Navy Diving Manual, March 1970 in my library. I was issued to us in the U.S.A.F. and I keep it as a great reference. It goes into detail on the USD Aquamaster, and how to service it. I also like the physics diagrams, and have used the diagram on breathing cycles. I even used that diagram for explaining breathing to a voice teacher from my church choir.
John
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Post by tomcatpc on Oct 12, 2019 16:23:30 GMT -8
I have not had the time to delve into it much yet. But the impression I get is that it has more to do with surface supplied diving than SCUBA? That is fine because as of late I have had a growing interest in hard hat diving. Not sure I'm ever going to get a go at it?, but the interest is there. Mark
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Post by SeaRat on Oct 12, 2019 17:09:56 GMT -8
Here's the "Figure 1-24--Lung volume" from page 56 or the U.S. Navy Diving Manual, March 1970 version: USN Lung Volume001 by John Ratliff, on Flickr This is the best example of lung volumes published, IMHO. There are others in the newer U.S. Navy Manuals. Here are two newer examples: Figure 3-5 Lung Volumes by John Ratliff, on Flickr Static Lung Volumes by John Ratliff, on Flickr Neither of these latter ones are quite as good as the original. Again, my opinion. All three of these illustrate the problems of current full-face snorkeling mask designs, as they advertise them as using only nose-breathing, and "normal breathing." This "normal breathing" represents "tidal volume," which you can see in all of these diagrams is a very small amount, not enough in my opinion to push the CO2-laden air out of the facemask and allow outside, fresh air, in. These masks need the snorkeler to use deep breathing techniques to use them safely. John
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