hello all   these cylinders ar simaler to old mercury containers ,if on mine site processing gold most likely  . peter

What is it? or more specifically what kind of product would it have contained?
looks like a high pressure gas bottle. Bung on top is solid with no ability for the high pressure gas to escape. Only letters I could find was "Dalmine" stamped in the bottle near the top.
When full, someone would have to unscrew the top, open to atmosphere, screw it on to whatever appliance it was used on then pressurize it...

To make acetylene one needs to mix water with calcium carbonate.... Hmmmm it does have some sort of black substance in it....

I picked this thing up at a mine site that never really got off the ground.

Since the pic was taken I have wire wheeled it and found no other markings. I did start a thread on another unrelated forum where it was sugested this was a Tenaris Dalmine cylinder. That may be true and all but it still doesn't get me any closer to knowing what it contained and why such a high pressure (looking) bottle would have a solid bung on top. Every cylinder in the pile was the same. Some cylinders were shaped a little different in that they may not have been as capable of as high a pressure as this example but they all had the solid bung that had to be unscrewed before getting to the contents.

The bottle:


the dump:

Since you posted his 'cooling tanks',
he should post 'cooling you're welcomes'.......

At -20C and below, if the crankcase is not heated and heat is only applied to the intake, the block is so cold that moist air entering the intake will freeze inside the cylinder and prevent the engine from turning at all. So applying heat to the intake alone can be problematic unless one can crank the engine.