revdocdrew:

The definition of "steel" is what I took note of in reading some of Greener's publications. If I understand it correctly, they deemed iron(horsenail stubs, saws, etc.) to be better than steel. And then the types of barrels, all with some addition of steel. But as I have said, I think their school of thought changed with time.

Kind Regards,

Raimey
rse