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YankeeMetallic
12-12-2014, 08:10 PM
I inherited a bunch of my grandfathers tools about 15 years ago.
He was a welder, shipbuilder, submarine welder during WWII.
He was a master at welding anything, and he used to make some his own welding gasses.

I found a metal stamp that has had me puzzled ever since. It is the type to mark metal, such as gas cylinders.

The stamp shows a large "R" with a smaller "N""2" in the top half enclosed portion of the "R" and a "S15" in the lower half between the two legs of the "R".

I can't figure out if it is a gas compound or what?

http://i41.photobucket.com/albums/e254/YankeeMetallic/GasStamp.jpg (http://s41.photobucket.com/user/YankeeMetallic/media/GasStamp.jpg.html)

boslab
12-12-2014, 09:46 PM
N superscript 2 is nitrogen N2, I have no idea what the S one is, have seen special gasses with S on like Argon 5% methane ,stuff like that
Mark

YankeeMetallic
12-12-2014, 10:10 PM
Added an image of the stamp

macona
12-13-2014, 01:42 AM
Nothing that I can imagine, it may be a "makers" mark.

boslab
12-13-2014, 05:36 AM
I do remember something from the fuel lab in work, fuel oil s15 was a low sulphur diesel oil, probably nothing but?
Mark