Very nice, beats this from "way back when".
I did note they can wear whatever gloves they like.
Check this vintage ad out...
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I did note they can wear whatever gloves they like.
OP
Do you still have that board?
No, this is a stock photo, but used one like it after leaving the Navy, the Navy one had the same type of handles but the board was more pointed at the front, compass in the middle, depth gauge and watch on the sides [as above].
Mine was stolen [as was other gear] in a move, did not notice it for months as it was was not required for awhile.
I've found that photo I was telling you about in the above post. I took these photos during our training at the U.S. Naval School for Underwater Swimmers in 1967. Note that these were the antimagnetic twin 90 cubic foot tansk, and that the diver on the left of the first photo has an Anti-magnitic DA Aquamaster mounted on the tanks. Note also that they have a round bottom.
We were in the Key West harbor, diving in near zero visibility with a bag of parts that we needed as a buddy team to put together on the bottom. We had to have the parts fully assembled before surfacing. This was an exercise in both buddy diving, and doing things by feel in very low visibility.
SeaRat
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@John C. Ratliff,
Do you recall the out-of-water weight and buoyancy characteristics of those Al 90's doubles? Also, physical dimensions and service pressure? TIA.
ETA: Interesting that the J-valve is on the "wrong" side.
rx7diver
Both of those pictures are mirrored image. You can tell that the regulators are mirrored. John has posted those pictures many, many times and I never noticed that before. Thanks for noticing that...
OK, I had to double check if they are mirror images. It could have been possible to assemble the regulators with the intake and the exhaust reversed, but the label in the exhaust can would have been wrong. The regulators are definitely mirror image.
One more look at those pictures, and now I am really confused. The numbers on the cylinders don't look to be mirrored imaged. But, the regulators definitely look like mirror image.
Are the numbers on the cylinders up-side-down? To be read from above on a horizontal tank rack?
The Mil spec for those cylinders is available to the public (as well as the mil spec for the steel 72). You can get a copy at VDH, but I will try to post it in a bit.
Both of these documents have been approved for public release.
BlueWaterDiver2
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BlueWaterDiver2
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That ad kinda reminds me of the shoe fitting fluoroscope ads from the 1930s and 40s.
Fortunately there was no future in that.
Fortunately there was no future in that.
From what I have read, the cylinders were made by PST (Pressed Steel Tanks) company, with a contract from the Navy.
They were made from 6061 aluminum seamless pipe and the ends were formed by a spun/ forming process. The forming process left a gap in the center of the bottom and that is why the plug was formed into the process.
AFAIK, at the time there were no aluminum DOT cylinders. These are not DOT cylinders, but the mil standard shadows all the DOT technical requirements, including the design characteristics (for elastic expansion, stress/strength characteristics), the manufacturing process and the hydrostatic testing requirements (CGA Pamphlet C-1).
Some of the extra specifications were related to the non-magnetic requirements.
The ratio of material thickness of the bottom versus the side walls is driven by the forming method during manufacturing. All this cylinders are required to be formed from either one plate (most steel cylinders), a seamless cylinder/ tubing, or a block of metal (like most modern aluminum cylinders). Fusing by welding or other similar methods is not allowed.
The cylindrical side walls experience a higher stress the than the partially hemispherical end, therefore the side walls will drive the wall thickness. The end thickness tends to be just the result of the manufacturing process.
BTW, I have seen a DOT steel cylinders (I think, made in Japan) that were made with the same seamless pipe with spun ends. I looked inside and you could tell that the bottom was spun.
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