Your starter, for 10

**LINK**

https://shop.bsigroup.com/ProductDetail/?pid=000000000000163551

MichaelG.

.

… and a useful Wikipedia page :

https://en.wikipedia.org/wiki/Brinell_scale

Edited By Michael Gilligan on 23/02/2021 17:10:36

I've never seen such a thing previously but you could be right, judging by the faint words along the front. There is a hardness-test technique based on indentation made by a hared steel ball, so this may be part of such a hardness-testing kit, but I am foxed by the disposition of the hollows.

Might have been for some specific trade.

Have you tried investigating the company itself – Avery Denison? (Probably long gone but worth a try.)

The part number could be RS. A hardness tester where each square is a test ?

Next question ? Noel

My guess is the plate was used to check a hardness testing machine is delivering the right whack and the ball isn't damaged. It tests the test machine, which is how I read David Jupp's answer.

The plate would have started blank and then been dinged periodically to confirm the test machine is in good order. The dents should be identical, but will gradually deteriorate as the machine ages. The plate is evidence of how consistent the machine is. I suspect it's naughty to put more than one ding per square because a too close dent might effect the local hardness.

If the plate was made to confirm a hardness tester was performing to standard, then the plate was also made to a standard. Expensive when new, I suggest this one is used up and useless.

Could be completely wrong!

Dave

Intergallactic multidimensional dominos.

Anyone watching 'Fringe' will know it came from the parallel earth in exchange for a box of ballpoint pens.

Someone might be looking for one of those. Whack it on eBay with a sensible reserve and someone somewhere might be very glad to have it.