Have a house point that boy! 
These are mounts for mirrors to use with the autocollimator.
The 1976 surplus-from-work surface grinder was used to rough grind the bed plate of the 1952 Hardinge HLV when I was rebuilding it. That needed spot-grinding to get it flat enough (too hard to scrape). Since then I've rebuilt/re-scraped most of the Beaver milling machine (still got some more work to do on the head).
In the process of having a tidy-up in the shed, I realized that the collection of scrap hard disks from work would take far less space in the form of ingots.
Once I'd done that, I made some castings for mirror mounts.
Now I'm working on joining the mirrors to the mounts…
I think I'm heading towards the "sort-of kinematic design", but that's not fixed in stone yet.