I found this in my attic a while ago, and did not know what it was. It was dirty, rusty, and very very black. It has a wooden base, which too was in need of a good clean. I have cleaned it up and I finally realised it is a sharpening stone. It has two sides, one rougher than the other (I would not be able to tall you what grade each side is). So I decided to use it tonight, and for the purposes of this experiment I used an old stainless steel knife I had from Sainsburys (so I will not ruin anything nice, just in case). I have to admit that it worked very well, the knife is now razor sharp (it can cut paper just by touching it lightly). On the side, between the two stone faces, it reads 'NORTON'. So I googled it, and found out that there is a company that makes sharpening stones called Norton, so it all falls in place. With the specimen I have being so old, I could not find it on their website, so I was wondering if anyone here can tell me a bit more about it. I attach a few pictures.
I would be obliged if you could let me know how to use it. Do I use oil, water or just dry sharpen? In my 'experiment' I went dry, and after a while I just wet it with some water. I think it worked well either way, but please enlighten me if you can.
Many thanks in anticipation!